HTML+JS好例子集锦
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HTML+JS好例子集锦
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HTML+JS好例子集錦
一些HTML+JavaScript好例子，有些例子照網絡資料，包括： HTML+JS限時小學數學出題、打開對話框選擇本地文件、?簡單畫布畫板、?俄羅斯方塊游戲、?落英紛飛動畫 、隨機點名器的示例等。從中感受HTML+JavaScript可以實現功能的強大。
基礎知識參見? HTML5+CSS新手入門學習系列?CSDN
一、HTML+JS限時小學數學出題
先給出效果演示圖：
源碼如下：
<!doctype html> <html> <head> <meta charset="UTF-8"> <title>簡單的出題計算</title><style type="text/css"> body{font-family:Dunkin,"開心軟件甜蜜蜜簡體","Segoe","Segoe UI","微軟雅黑",sans-serif;font-size:30px;background-color:#fff} input,button{font-family:Dunkin,"開心軟件甜蜜蜜簡體","Segoe","Segoe UI","微軟雅黑",sans-serif;font-size:20px} .title{width:100%;height:100%;position:absolute;left:0;top:0;background-color:#fff;z-index:3;} #ti{font-family:Dunkin,"Segoe","Segoe UI",sans-serif;font-size:50px;background-color:#fff} </style></head> <body><div class="title" id="title"><br><br><h3 align="center">簡單的小學數學隨機出題，限時</h3><center><input type="button" value="開始答題" onclick="$('title').style.display='none';dati()"></center> </div><center><br><h2 id="ti">17+12</h2><br><input type="text" id="texts"><br><br><input type="button" value="判斷" onclick="ok()"><input type="button" value="清除" onclick="cls()"><br><br>答對<span id="att1">0</span>題 打錯<span id="att2">0</span>題<br><span id="att3">60</span></center><script> function $(i){return document.getElementById(i) }function rand(min,max){return Math.round(Math.random()*(max-min)+min)}var dui=0,cuo=0,time=60,fu1=0,fu2=0,add=0,pd=29; function dati(){dui=0;cuo=0;time=60$("att1").innerHTML="0"$("att2").innerHTML="0"$("att3").innerHTML="倒計時：60"var art=setInterval(function(){time--$("att3").innerHTML="倒計時：" + timeif(time<=0){alert("時間到");$('title').style.display='';clearInterval(art)}},1000)document.getElementById("texts").focus(); //文本框獲取焦點tis() }function tis(){fu1=rand(5,100);fu2=rand(5,100);add=rand(0,1)if(fu2>fu1){add=0}if(add==0){pd=fu1+fu2}if(add==1){pd=fu1-fu2}$("ti").innerHTML=fu1+""+["+","-"][add]+""+fu2 }function ok(){if($("texts").value==pd){dui++;$("att1").innerHTML=dui}else{cuo++;$("att2").innerHTML=cuo}tis()}function cls(){document.getElementById("texts").value = ""; //清空文本框document.getElementById("texts").focus(); //文本框獲取焦點 }</script></body> </html>二、打開對話框選擇本地文件
先給出效果演示圖：
源碼如下：
<!DOCTYPE html> <html> <head><meta charset="utf-8"><title></title> </head> <body> <script> function show() {var reader = new FileReader();reader.onload = function() {//document.body.innerText = this.result; //alert(this.result)document.getElementById("content1").value = this.result; //將文本文件的內容讀入textarea中}var f = document.getElementById("filePicker").files[0];reader.readAsText(f); } </script> <input type="file" name="file" id="filePicker"/> <br> <input type="button" value = "顯示" onclick="show()"/> <br> <textarea id="content1" cols="50" rows="10">顯示區</textarea> </body> </html>三、?簡單畫布畫板
先給出效果演示圖：
可以按著鼠標左鍵繪圖寫字。
源碼如下：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>canvas繪圖板</title> <style> canvas{border:1px dashed black;} </style> <script type="text/javascript"> var canvas; var context; window.onload=function(){canvas=document.getElementById("drawingCanvas");context=canvas.getContext("2d");context.fillStyle="rgb(255,255,255)";context.fillRect(0,0,canvas.width,canvas.height);context.strokeStyle="rgb(0,0,0)";context.lineWidth=5;canvas.onmousedown=startDrawing;canvas.onmouseup=stopDrawing;canvas.onmouseout=stopDrawing;canvas.onmousemove=draw;}; var previousColorElement; function changeColor(color,imgElement){context.strokeStyle=color;imgElement.className="Selected";if(previousColorElement!=null){previousColoeElement.className="";}previousColorElement=imgElement;} var previousThicknessElement; function changeThickness(thickness,imgElement){context.lineWidth=thickness;imgElement.className="Selected";if(previousThicknessElement!=null){previousThicknessElement.className="";}previousThicknessElement=imgElement;} var isDrawing=false; function startDrawing(e){isDrawing=true;context.beginPath();context.moveTo(e.pageX-canvas.offsetLeft,e.pageY-canvas.offsetTop);} function draw(e){if(isDrawing==true){var x=e.pageX-canvas.offsetLeft;var y=e.pageY-canvas.offsetTop;context.lineTo(x,y);context.stroke();}} function stopDrawing(){isDrawing=false;} function clearCanvas(){context.fillStyle="rgb(255,255,255)";context.fillRect(0,0,canvas.width,canvas.height);} </script> </head> <body> <div align="center">COLOR<input type="color" id="colorSelect" onchange="changeColor(colorSelect.value,this);" value="rgb(255,255,255)"/> WIDTH<input type="range" id="widthSelect" onchange="context.lineWidth=widthSelect.value;" min="1" max="20" value="5"/> <button id="clearCanvas" onclick="clearCanvas();">CLEAR ALL</button><br/><canvas id="drawingCanvas" width="800" height="400"></canvas> </div> </body> </html>四、?俄羅斯方塊游戲
先給出效果演示圖：
可以贏鍵盤上的箭頭鍵移動或旋轉方塊
源碼如下：
<!doctype html> <HTML> <HEAD><title>Tetris</title> <script>window.resizeTo(410,450)</script> <style> <!-- .MB {BACKGROUND-COLOR: firebrick;CURSOR: default;HEIGHT: 22px;WIDTH: 22px } .SB {BACKGROUND-COLOR: slategray;CURSOR: default;HEIGHT: 22px;WIDTH: 22px } .BK {BACKGROUND-COLOR: white;CURSOR: default;HEIGHT: 22px;WIDTH: 22px } .GT {BORDER-BOTTOM: deepskyblue thin solid;BORDER-LEFT: deepskyblue thin solid;BORDER-RIGHT: deepskyblue thin solid;BORDER-TOP: deepskyblue thin solid;CURSOR: default } --> </style> <script> <!-- var BX=new Array(4); var BY=new Array(4); var PX=new Array(4); var PY=new Array(4); var mTimer var firstView var gameState = 0;function beginGame() {gameState=0;speed=1;outTime=1100-speed*100;score=0;if(gameState!=0)return;firstView=true;for(j=0;j<16;j++)for(i=0;i<10;i++)setClass(i,j,"BK");randBar();gameState=1;Play.disabled=true;window.clearInterval(mTimer);mTimer=window.setInterval("moveBar()",outTime); }function keyControl() {if(gameState!=1)return;switch(event.keyCode){case 37:{ //leftfor(i=0;i<4;i++)if(BX[i]==0)return;for(i=0;i<4;i++)if(getClass(BX[i]-1,BY[i])=="SB")return;for(i=0;i<4;i++)setClass(BX[i],BY[i],"BK");for(i=0;i<4;i++)BX[i]=BX[i]-1;for(i=0;i<4;i++)setClass(BX[i],BY[i],"MB");break;}case 38:{ //upvar preMBarX=new Array(4);var preMBarY=new Array(4);var cx=Math.round((BX[0]+BX[1]+BX[2]+BX[3])/4);var cy=Math.round((BY[0]+BY[1]+BY[2]+BY[3])/4);for(i=0;i<4;i++){preMBarX[i]=Math.round(cx-cy+BY[i]);preMBarY[i]=Math.round(cx+cy-BX[i]);if(preMBarX[i]<0 || preMBarX[i]>9 || preMBarY[i]<0 || preMBarY[i]>15)return;if(getClass(preMBarX[i],preMBarY[i])=="SB")return;}for(i=0;i<4;i++)setClass(BX[i],BY[i],"BK");for(i=0;i<4;i++){BX[i]=preMBarX[i];BY[i]=preMBarY[i];}for(i=0;i<4;i++)setClass(BX[i],BY[i],"MB");break;}case 39:{ //rightfor(i=0;i<4;i++)if(BX[i]==9)return;for(i=0;i<4;i++)if(getClass(BX[i]+1,BY[i])=="SB")return;for(i=0;i<4;i++)setClass(BX[i],BY[i],"BK");for(i=0;i<4;i++)BX[i]=BX[i]+1;for(i=0;i<4;i++)setClass(BX[i],BY[i],"MB");break;}case 40:{ //downmoveBar();break;}} }function delLine() {for(i=0;i<4;i++)setClass(BX[i],BY[i],"SB");for(j=0;j<16;j++){dLine=true;for(i=0;i<10;i++){if(getClass(i,j)!="SB"){dLine=false;break;}}if(dLine){score=score+100;for(k=j;k>0;k--)for(l=0;l<10;l++)setClass(l,k,getClass(l,k-1));for(l=0;l<10;l++)setClass(l,0,"BK");}}randBar();speed=Math.floor(score/3000)+1;outTime=1100-speed*100;scoreBar.innerHTML="Score : " + score;speedBar.innerHTML="Speed : " + speed;window.clearInterval(mTimer);mTimer=window.setInterval("moveBar()",outTime); }function getClass(x,y){return GameBar.children[y].children[x].className;} function setClass(x,y,cName){GameBar.children[y].children[x].className=cName;}function moveBar() {if(gameState!=1)return;dropLine=true;for(i=0;i<4;i++)if(BY[i]==15)dropLine=false;if(dropLine)for(i=0;i<4;i++)if(getClass(BX[i],BY[i]+1)=="SB")dropLine=false;if(!dropLine){window.clearInterval(mTimer);delLine();return;}for(i=0;i<4;i++)setClass(BX[i],BY[i],"BK");for(i=0;i<4;i++)BY[i]=BY[i]+1;for(i=0;i<4;i++)setClass(BX[i],BY[i],"MB"); }function pauseGame() {if(gameState==0)return;if(event.srcElement.value=="Pause"){gameState=2;event.srcElement.value="Continue";window.clearInterval(mTimer);}else{gameState=1;event.srcElement.value="Pause";mTimer=window.setInterval("moveBar()",outTime);} }function fMnu(){return false;} document.oncontextmenu=fMnu;function preview() {if(previewWnd.style.display!="none")previewWnd.style.display="none";elsepreviewWnd.style.display="block"; }function replayGame() {if(gameState!=1)return;if(!confirm("Really want to re-start the game?"))return;gameState=0;window.clearInterval(mTimer);beginGame(); } function randBar() {randNum=Math.floor(Math.random()*20)+1;if(!firstView)for(i=0;i<4;i++){BX[i]=PX[i];BY[i]=PY[i];}switch(randNum){case 1:{PX[0]=4;PY[0]=0;PX[1]=4;PY[1]=1;PX[2]=5;PY[2]=1;PX[3]=6;PY[3]=1;break;}case 2:{PX[0]=4;PY[0]=0;PX[1]=5;PY[1]=0;PX[2]=4;PY[2]=1;PX[3]=4;PY[3]=2;break;}case 3:{PX[0]=4;PY[0]=0;PX[1]=5;PY[1]=0;PX[2]=6;PY[2]=0;PX[3]=6;PY[3]=1;break;}case 4:{PX[0]=5;PY[0]=0;PX[1]=5;PY[1]=1;PX[2]=5;PY[2]=2;PX[3]=4;PY[3]=2;break;}case 5:{PX[0]=6;PY[0]=0;PX[1]=6;PY[1]=1;PX[2]=4;PY[2]=1;PX[3]=5;PY[3]=1;break;}case 6:{PX[0]=4;PY[0]=0;PX[1]=4;PY[1]=1;PX[2]=4;PY[2]=2;PX[3]=5;PY[3]=2;break;}case 7:{PX[0]=4;PY[0]=0;PX[1]=4;PY[1]=1;PX[2]=5;PY[2]=0;PX[3]=6;PY[3]=0;break;}case 8:{PX[0]=4;PY[0]=0;PX[1]=5;PY[1]=0;PX[2]=5;PY[2]=1;PX[3]=5;PY[3]=2;break;}case 9:{PX[0]=4;PY[0]=0;PX[1]=5;PY[1]=0;PX[2]=5;PY[2]=1;PX[3]=6;PY[3]=1;break;}case 10:{PX[0]=5;PY[0]=0;PX[1]=5;PY[1]=1;PX[2]=4;PY[2]=1;PX[3]=4;PY[3]=2;break;}case 11:{PX[0]=4;PY[0]=1;PX[1]=5;PY[1]=1;PX[2]=5;PY[2]=0;PX[3]=6;PY[3]=0;break;}case 12:{PX[0]=4;PY[0]=0;PX[1]=4;PY[1]=1;PX[2]=5;PY[2]=1;PX[3]=5;PY[3]=2;break;}case 13:{PX[0]=4;PY[0]=0;PX[1]=5;PY[1]=0;PX[2]=6;PY[2]=0;PX[3]=5;PY[3]=1;break;}case 14:{PX[0]=4;PY[0]=0;PX[1]=4;PY[1]=1;PX[2]=4;PY[2]=2;PX[3]=5;PY[3]=1;break;}case 15:{PX[0]=5;PY[0]=0;PX[1]=5;PY[1]=1;PX[2]=4;PY[2]=1;PX[3]=6;PY[3]=1;break;}case 16:{PX[0]=5;PY[0]=0;PX[1]=5;PY[1]=1;PX[2]=5;PY[2]=2;PX[3]=4;PY[3]=1;break;}case 17:{PX[0]=4;PY[0]=0;PX[1]=5;PY[1]=0;PX[2]=4;PY[2]=1;PX[3]=5;PY[3]=1;break;}case 18:{PX[0]=4;PY[0]=0;PX[1]=5;PY[1]=0;PX[2]=4;PY[2]=1;PX[3]=5;PY[3]=1;break;}case 19:{PX[0]=3;PY[0]=0;PX[1]=4;PY[1]=0;PX[2]=5;PY[2]=0;PX[3]=6;PY[3]=0;break;}case 20:{PX[0]=5;PY[0]=0;PX[1]=5;PY[1]=1;PX[2]=5;PY[2]=2;PX[3]=5;PY[3]=3;break;}}if(firstView){firstView=false;randBar();return;}for(i=0;i<4;i++){for(j=0;j<4;j++){previewBar.children[j].children[i].className="BK";}}for(i=0;i<4;i++)previewBar.children[PY[i]].children[PX[i]-3].className="MB";for(i=0;i<4;i++){if(getClass(BX[i],BY[i])!="BK"){alert("Game Over!");window.clearInterval(mTimer);Play.disabled=false;gameState=0;return;}}for(i=0;i<4;i++)setClass(BX[i],BY[i],"MB"); } // --> </script> </HEAD><BODY bgcolor="#EAF0F8" onkeydown="return keyControl();" topmargin="10" leftmargin="10" rightmargin="10" bottommargin="0" scroll=no> <table border="0" width="100%" cellspacing="0" cellpadding="0" height="100%"><tr><td width="100%" height="100%" align="center"> <table cellspacing=2 cellpadding=0 class=gt border=0 bordercolor="#EAF0F8" bgcolor="#EAF0F8"> <tr> <td valign="top"><table cellspacing=0 cellpadding=0 class=gt border=1 bordercolor="#EAF0F8" style=""><Tbody id=GameBar><tr><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td><td nowrap class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK></td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr></tbody></table> </td> <td valign="top" align="center" style="padding: 10 10 0 10" bgcolor="#466285"><table cellspacing=0 cellpadding=0 border=0><tr><td><font size=5 color=red face=consolas>Tetris</font></td></tr></table><table id="previewWnd" cellspacing=0 cellpadding=0 class=gt border=1 bordercolor="#EAF0F8" bgcolor="#EAF0F8" style="margin-top:15"><Tbody id="previewBar"><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr><tr><td class=BK> </td><td class=BK> </td><td class=BK> </td><td class=BK> </td></tr></tbody></table><table cellspacing=3 cellpadding=0 border=0 style="margin-top:15"><tr><td><input type=button id="Play" style="font-family:Tahoma; font-size:9pt; width:100px" value="Play" onclick="return beginGame();"></td></tr><tr><td><input type=button id="Pause" style="font-family:Tahoma; font-size:9pt; width:100px" value="Pause" onclick="return pauseGame();"></td></tr><tr><td><input type=button id="Preview" style="font-family:Tahoma; font-size:9pt; width:100px" value="Preview" onclick="preview();"></td></tr><tr><td><input type=button id="Replay" style="font-family:Tahoma; font-size:9pt; width:100px" value="Replay" onclick="replayGame();"></td></tr></table><table cellspacing=3 cellpadding=0 border=0 style="font-family:Tahoma; font-size:9pt; font-weight: bold; margin-top:10"><tr><td id=scoreBar style="color:#FFFFFF">Score : 0</td></tr><tr><td id=speedBar style="color:#FFFFFF">Speed : 1</td></tr></table> </td> </tr> </table> </td></tr></table> </BODY> </HTML> <script> function unSel() {document.execCommand("Unselect");window.setTimeout("unSel()",100); } unSel();</script>五、??落英紛飛動畫
先給出效果演示圖：
運行時花瓣動態飄落
源碼如下：
<!doctype html> <html> <head><title></title> <style type="text/css"> canvas{position: absolute;left: 0;top: 0; } </style> </head> <body bgcolor="#000000"> <canvas id="tree"></canvas> <canvas id="flower"></canvas> <script> //兩個canvas var tree = document.getElementById("tree"); tree.width = window.innerWidth; tree.height = window.innerHeight ; var tCxt = tree.getContext("2d"); var flower = document.getElementById("flower"); flower.width = window.innerWidth; flower.height = window.innerHeight ; var cxt = flower.getContext("2d");var flowerList = [];//櫻花列表 var rootTop = 450 ;//樹起點 var flowerColor = "rgba(255,192,203,.3)" ;//花色 var flowerColorDeep = "rgba(241,158,194,.5)" ;//花色深 var treeColor2 = "rgba(255,192,203,.5)" ;//樹枝顏色 var treeColor = "#FFF" ;//樹干顏色 var fallList = [];//飄落櫻花列表 var g = 0.01 ;//重力加速度 var gWind = 0.005;//風力加速度 var limitSpeedY = 1;//速度上限 var limitSpeedX = 1 ;//速度上限cxt.shadowColor= "#FFF" ; cxt.shadowBlur = 10 ;function drawTree(x,y,deg,step,type){var deg1 = step%2 == 0 ? 0.1 : -0.1 ;var x1 = x + Math.cos(deg+deg1) * (step+4) * 0.8 ;//以步長來判斷枝干長度 x軸偏移大一些var y1 = y + Math.sin(deg+deg1) * (step-1) * 0.8 ;//以步長來判斷枝干長度 Y軸壓縮一些tCxt.beginPath();tCxt.lineWidth = step/3;tCxt.moveTo(x,y);tCxt.lineTo(x1,y1);tCxt.strokeStyle = (step > 5 ) ? treeColor : treeColor2 ;//細紙條都換成花的顏色tCxt.stroke();if(step > 20){//樹干相交的位置有間隙，以一個圓填充tCxt.fillStyle = treeColor ;tCxt.arc(x,y,step/6,0,Math.PI*2);tCxt.fill();}if(step < 3 || (step < 23 && Math.random() > 0.1)){//末梢位置 畫花瓣var color = [flowerColorDeep,flowerColor,flowerColor][Math.round(Math.random()+0.2)] ;var r = 2+Math.random()*2tCxt.fillStyle = color ;tCxt.arc(x1+Math.random()*3,y1+Math.random()*3,r,0,Math.PI)tCxt.fill();flowerList.push({x:x,y:y,sx:(Math.random()-0.5),sy:0,color:color,r:r,deg:deg});//保存下畫櫻花的位置}step -- ;if(step > 0){drawTree(x1,y1,deg,step,type);if(step%3 == 1 && step > 0 && step < 30)drawTree(x1,y1,deg+0.2 + 0.3 * Math.random(),Math.round(step/1.13));//右分叉if(step%3 == 0 && step > 0 && step < 30)drawTree(x1,y1,deg-0.2 - 0.3 * Math.random(),Math.round(step/1.13));//左分叉} }drawTree(tree.width/2,rootTop,-Math.PI/2,30,1);//執行var len = flowerList.length ; function step(){if(Math.random() > 0.3) fallList.push(flowerList[Math.floor(Math.random()*len)]);//隨機取出一個，花瓣復制到飄落花瓣的列表中cxt.clearRect(0,0,tree.width,tree.height);for(var i = 0 ;i < fallList.length ; i ++){if(fallList[i].sy < limitSpeedY) fallList[i].sy += g ;fallList[i].sx += gWind ;fallList[i].x += fallList[i].sx ;fallList[i].y += fallList[i].sy ;if(fallList[i].y > rootTop+30){//飄到樹根+30的花瓣移除fallList.splice(i,1);i -- ;continue ;}cxt.beginPath();cxt.fillStyle = fallList[i].color ;fallList[i].deg += fallList[i].sx*0.05 ;//跟速度相關的旋轉花瓣cxt.arc(fallList[i].x,fallList[i].y,fallList[i].r,fallList[i].deg,fallList[i].deg+Math.PI*1.3);cxt.fill();}requestAnimationFrame(step); } requestAnimationFrame(step); </script> </body> </html>六、隨機點名器的示例代碼
先給出效果演示圖：
源碼如下：
<!DOCTYPE html> <html> <head><meta charset="UTF-8"><title>隨機點名生成</title><style>/* 頁面css樣式 */.wrapper {width: 800px;margin: 60px auto;border: 1px solid #ddd;text-align: center;}.box li {vertical-align: top;display: inline-block;width: 100px;height: 50px;border: 2px solid #ddd;border-radius: 15px;text-align: center;line-height: 50px;margin: 5px;}.wrapper button {border: none;width: 100px;height: 50px;border-radius: 10px;cursor: pointer;outline: none;margin-top: 20px;font-weight: bolder;color: #333;background-color: rgb(14, 146, 43);}.wrapper button {display: inline-block;}body {background-color: #eee;}</style></head><body><div class="wrapper"><h1 align="center">隨機點名系統</h2><h6 id="data" align="right"></h6><ul class="box"></ul><button class="start">開始</button><button class="stop">停止</button></div> </body><script>//定義全局變量方便引用var boxUl = document.getElementsByClassName('box')[0];var start = document.getElementsByClassName('start')[0];var stop = document.getElementsByClassName('stop')[0]var oLi = document.getElementsByTagName('li');//數據準備var nameString = new String("張明民,燕妍,滕朗,陶金震,彭祥,蘇歌瀾,李鈺光,宣藝,童孝輝,徐都蓓,徐元,繆貝平,張中斌,林伯,冉凱進,戚玉素,楚婷,魯利,孫玉筠,益友旭,孟義政,曾鈺中,寧豪,鮑仁俊,文長達,裴義健,江智婉,龔娜");var nameArr = nameString.split(",");//獲取每個學生姓名添加到標簽中，自動解析html標簽var str = "";for (let i = 0; i < nameArr.length; i++) {str += "<li >" + nameArr[i] + "</li>"}boxUl.innerHTML = str;//添加開始按鈕的點擊事件var timer = null;start.onclick = function () {// 設置定時器timer = setInterval(function () {// 根據數組長度范圍生成隨機數var i = Math.floor(Math.random() * nameArr.length);// 先通過for循環清空所有style屬性for (var j = 0; j < oLi.length; j++) {oLi[j].removeAttribute("style");}// 為隨機選擇的li顏色屬性oLi[i].style.background = "red";}, 150);};// 點擊停止stop.onclick = function () {// 清空定時器停止點名clearInterval(timer);}//頁面初始化時間設置window.onload = function () {datatime();}//頁面時間動態刷新setInterval(datatime, 1000);function datatime() {let data = new Date();let dataString ="現在是北京時間：" + data.toLocaleString();document.getElementById("data").innerHTML = dataString;} </script> </html>OK!
總結
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