代码参考于网上面试题
function getValue (key) {
var _href = window.location.href;
if(_href.split('?')[0] === _href) {
return "";
}
var arr = _href.split('?')[1].split('&');
var obj = {}
for (var i=0; i<arr.length; i++) {
_data = arr[i].split('=');
obj[_data[0]] = _data[1];
}
return obj['key'];
}