首先：我對Javascript很少熟悉，但主要是我做CSS和HTML。

我正在創建一個網站，我有一個非常大的圖像，所以我下載了一個代碼來實現圖片上的放大鏡效果。然而，圖像有很多細節需要放大更多才能欣賞。有沒有什么辦法可以修改這段代碼來創建更深層次的圖像縮放？

這是我使用的代碼：

我相信這是創建放大鏡效果的代碼中最相關的部分：

$(document).ready(function(){

var native_width = 0;

var native_height = 0;

$(".large").css("background","url('" + $(".small").attr("src") + "') no-repeat");

//Now the mousemove function

$(".magnify").mousemove(function(e){

//When the user hovers on the image, the script will first calculate

//the native dimensions if they don't exist. Only after the native dimensions

//are available, the script will show the zoomed version.

if(!native_width && !native_height)

{

//This will create a new image object with the same image as that in .small

//We cannot directly get the dimensions from .small because of the

//width specified to 200px in the html. To get the actual dimensions we have

//created this image object.

var image_object = new Image();

image_object.src = $(".small").attr("src");

//This code is wrapped in the .load function which is important.

//width and height of the object would return 0 if accessed before

//the image gets loaded.

native_width = image_object.width;

native_height = image_object.height;

}

else

{

//x/y coordinates of the mouse

//This is the position of .magnify with respect to the document.

var magnify_offset = $(this).offset();

//We will deduct the positions of .magnify from the mouse positions with

//respect to the document to get the mouse positions with respect to the

//container(.magnify)

var mx = e.pageX - magnify_offset.left;

var my = e.pageY - magnify_offset.top;

//Finally the code to fade out the glass if the mouse is outside the container

if(mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0)

{

$(".large").fadeIn(100);

}

else

{

$(".large").fadeOut(100);

}

if($(".large").is(":visible"))

{

//The background position of .large will be changed according to the position

//of the mouse over the .small image. So we will get the ratio of the pixel

//under the mouse pointer with respect to the image and use that to position the

//large image inside the magnifying glass

var rx = Math.round(mx/$(".small").width()*native_width - $(".large").width()/2)*-1;

var ry = Math.round(my/$(".small").height()*native_height - $(".large").height()/2)*-1;

var bgp = rx + "px " + ry + "px";

//Time to move the magnifying glass with the mouse

var px = mx - $(".large").width()/2;

var py = my - $(".large").height()/2;

//Now the glass moves with the mouse

//The logic is to deduct half of the glass's width and height from the

//mouse coordinates to place it with its center at the mouse coordinates

//If you hover on the image now, you should see the magnifying glass in action

$(".large").css({left: px, top: py, backgroundPosition: bgp});

}

}

})

})

總結

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