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 = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/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 = /"[^"\\\r\n]*"|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);
     };