【JS】字符串转换成JSON，兼容低级浏览器

parse_json.js

function parseJSON( data ) {
    var // JSON RegExp
        rvalidchars = /^[\],:{}\s]*$/
        , rvalidbraces = /(?:^|:|,)(?:\s*\[)+/g
        , rvalidescape = /\\(?:["\\\/bfnrt]|u[\da-fA-F]{4})/g
        , rvalidtokens = /"[^"\\\r\n]*"|true|false|null|-?(?:\d+\.|)\d+(?:[eE][+-]?\d+|)/g
        ;
    if ( window.JSON && window.JSON.parse ) {
        return window.JSON.parse( data );
    }
    if ( data === null ) {
        return data;
    }
    if ( typeof data === "string" ) {
        data = data.replace(/^\s+|\s+$/g, '');
        if ( data && rvalidchars.test( data.replace( rvalidescape, "@" )
            .replace( rvalidtokens, "]" )
            .replace( rvalidbraces, "")) ) {
            return ( new Function( "return " + data ) )();
        }
    }
    return '';
}