JavaScript获取URL中的参数

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function getQueryString(name){

var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");

var r = window.location.serarch.substr(1).match(reg);

//decodeURI()函数可对encodeURI函数编码过的URI进行解码；

if (r != null) {

  return decodeURI(r[2]);

return null;