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<head>
<meta charset="utf-8">
<title>截取url参数</title>
<script type="text/javascript">
/**
* getParamVal 基础函数
* 获取url中参数的key和value
* 返回json对象
*/
function getParamVal() {
var params = {};
if ( location.search !== '' ) {
var arr = location.search.substring(1).split('&');
for ( var i = 0, iLen = arr.length; i < iLen; i ++ ) {
var aTmp = arr[i].split('='), value = decodeURIComponent(aTmp[1]), numberVal = Number(value);
//处理数字
if ( typeof numberVal === 'number' && numberVal === numberVal ) {
value = numberVal;
}
//处理布尔值
if ( value === 'true' || value === 'false' ) {
value = value === 'true';
}
params[aTmp[0]] = value;
}
}
return params;
}
//用法：url html?id=5&state=5asdfasede&viral=2
/*
var params = getParamVal();
alert(params['id']);
*/
/**
* 智能截取url参数中的数值
* getParamNumber 获取参数值中从第n位开始截取len长度的数字，当遇到非数字类型时终止截取
* 注：依赖 getParamVal 函数
* 返回截取后的数值，number类型
*/
function getParamNumber(key, n, len) {
var vals = getParamVal()[key],
valN = '';
if ( !vals ) return undefined;
for ( var i = n; i < len+n; i ++ ) {
var iTmp = Number(vals.charAt(i));
if (typeof iTmp == 'number' && iTmp === iTmp) {
valN += vals.charAt(i);
} else {
break;
}
}
return valN ? Number(valN) : undefined;
}
//用法 url html?state=210.0&openid=520SN6jhUe5gI&id=15524ses
alert( getParamNumber('openid', 1, 3) );
</script>
</head>
<body>
</body>
</html>
