function get_code(code_length){ //驗證碼設置var rand_aa=""; //最終的結果var code=new Array("0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"); //設置需要參加驗證的數字或字母var code_Num=code.length; //數組的長度for(i=0;i<code_length;i++){ //做一個循環，從里面抽取//Math.random()隨機抽取后續的數組里面的元素//parseInt 取得整數，也就是把隨機取出的數組下標取整var ran_ss=parseInt(Math.random()*code_Num);rand_aa+=String(code[ran_ss]); //將元素加入到結果里面}document.write("<input type=text name=check_code size="+code_length+" value="+rand_aa+" class=blank_bg maxsize=10 readonly=true>");//對數組進行輸出 }

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轉載于:https://www.cnblogs.com/xiaoCon/archive/2013/02/26/2934312.html

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