JS通用方法总结（一）

 /**
  * id数组转换为json字符串
  */
 function arrayTojson(arr) {
     var jsonIds = "[";
     for ( var i = 0; i < arr.length; i++) {
         if (i == arr.length - 1) {
             jsonIds += arr[i].eventid;
         } else {
             jsonIds += arr[i].eventid + ",";
         }
     }
     return jsonIds += "]";
 }

 /**
  * 获取系统的url
  * @returns fullUrl：系统访问路径，例如：http://localhost:8080/amudraya/amudraya
  */
 function getURL(){
     var fullUrl = window.location.href;
     var a=fullUrl.lastIndexOf('/');
     fullUrl=fullUrl.substring(0,a);
     var b=fullUrl.lastIndexOf('/');
     fullUrl=fullUrl.substring(0,b);
     var c=fullUrl.lastIndexOf('/');
     fullUrl=fullUrl.substring(0,c);
     return fullUrl;
 }

Js验证码

 /**========================验证码开始=============**/
 var code ; //在全局 定义验证码
 function createCode(){
     code = "";
     var codeLength = 4;//验证码的长度
     var checkCode = document.getElementById("checkCode");
     checkCode.value = "";
     var selectChar = new Array(1,2,3,4,5,6,7,8,9,
             'a','b','c','d','e','f','g','h','j','k','l','m','n','p','q',
             'r','s','t','u','v','w','x','y','z','A','B','C','D','E','F',
             'G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z');      

     for(var i=0;i<codeLength;i++) {
         var charIndex = Math.floor(Math.random()*60);
         code +=selectChar[charIndex];
     }
     if(code.length != codeLength){
       createCode();
     }
     checkCode.value = code;
 }
 function validate () {
     var inputCode = document.getElementById("loginCodeId").value.toUpperCase();
     var codeToUp=code.toUpperCase();
     if(inputCode.length <=0) {
       alert("请输入验证码！");
       return false;
     }
     else if(inputCode != codeToUp ){
        alert("验证码输入错误！");
        createCode();
        return false;
     }
     else {
       return true;
     }
 }
 /**======================验证码结束==================**/
 /**
  * 关闭忘记密码页面
  */
 function closeWindow(){
     $win.window('close');
 }