ReferenceError: “alert” is not defined

用Node.js单独运行js文件时，其中定义的alert不可用

alert is not part of JavaScript, it's part of the window object provided by web browsers. 

同样

var name = "The Window";

function ttt() {
    return(this.name);
}
alert(ttt.call(window);    //alert(window);

var object = {
    name : "My Object",
    getNameFunc : function(){
        return function(){
            return this.name;
        };
    }
};
console.log(object.getNameFunc()());    // console    The Window

var name = "The Window";
var object = {
    name : "My Object",
    getNameFunc : function(){
        var that = this;
        return function(){
            return that.name;
        };
    }
};
console.log(object.getNameFunc()());        //console     My Object

如果是在Node.js中运行的话，window会提示“undedined”。