String.prototype.format = function (args) {var result = this;if (arguments.length > 0) {    if (arguments.length == 1 && typeof (args) == "object") {        for (var key in args) {            if (args[key] != undefined) {                var reg = new RegExp("({" + key + "})", "g");                result = result.replace(reg, args[key]);            }        }    }    else {        for (var i = 0; i < arguments.length; i++) {            if (arguments[i] != undefined) {                var reg = new RegExp("({[" + i + "]})", "g");                result = result.replace(reg, arguments[i]);            }        }    }}return result;}

var chattag = " <div class=‘plain‘ style=‘height: 50px;margin-top: 10px;‘>                     <pre class=‘js_message_plain ng-binding pull-right‘                        style=‘background-color: #b2e281‘>{content}</pre></div>";var chatdiv = chattag.format({content:content});$(‘#chatcontent‘).append(chatdiv);