js读取href中的参数函数
function GetQueryValue (queryName) {
var query = decodeURI(window.location.search.substring(1));
var vars = query.split("&");
for (var i = 0; i < vars.length; i++) {
var pair = vars[i].split("=");
if (pair[0] == queryName) { return pair[1]; }
}
return null;
}