一些常用JS 函数总结

搜索url参数

/**
     * 搜索url参数 
     * @param  {String} name 参数键名
     * @return {String}      对应值
     */
    function getQueryVariable(name) {
        var result = location.search.match(new RegExp("[?&]" + name + "=([^&]+)", "i"));
        if (result == null || result.length < 1) {
            return "";
        }
        return result[1];
    };

删除字符串空格

    /**
     * 删除字符串空格
     * @param  {String} text 输入字符串
     * @return {String}      
     */
    function trim(text) {

        var rtrim = /^[suFEFFxA0]+|[suFEFFxA0]+$/g;

        return text == null ?
            "" :
            (text + "").replace(rtrim, "");
    };

字符串转JSON

    function parseJSON(data) {

        // Attempt to parse using the native JSON parser first
        if (window.JSON && window.JSON.parse) {
            return window.JSON.parse(data);
        }

        if (data === null) {
            return data;
        }

        if (typeof data === "string") {

            var rvalidchars = /^[],:{}s]*$/,
                rvalidbraces = /(?:^|:|,)(?:s*[)+/g,
                rvalidescape = /\(?:["\/bfnrt]|u[da-fA-F]{4})/g,
                rvalidtokens = /"[^"\
]*"|true|false|null|-?(?:d+.|)d+(?:[eE][+-]?d+|)/g,
                // Make sure leading/trailing whitespace is removed (IE can't handle it)
                data = trim(data);

            if (data) {

                // Make sure the incoming data is actual JSON
                // Logic borrowed from http://json.org/json2.js
                if (rvalidchars.test(data.replace(rvalidescape, "@")
                        .replace(rvalidtokens, "]")
                        .replace(rvalidbraces, ""))) {

                    return (new Function("return " + data))();
                }
            }
        }

        console.error("Invalid JSON: " + data);
    };