jquery js解析函數、函數直接調用

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-----------------------------------------------------------------cc = function(){alert(345)},pushStack = function() {    cc();},pushStack();//345//沒加var的放在window對象中pushStack = function() {    cc();},cc = function(){alert(345)},pushStack();//345----------------------------------------------------------------pushStack = function() {    cc();//cc is not defined};pushStack();cc = function(){alert(345)};pushStack = function() {    cc();};pushStack();//345function cc(){alert(345)};----------------------------------------------------------------cc = function(){alert(345)};pushStack();//pushStack is not defined ,js解析器執行到這裡的時候pushStack還是未定義pushStack = function() {    cc(); };cc = function(){alert(345)};pushStack();//345,js解析器執行到這裡的時候pushStack已經定義了function pushStack() {    cc(); };

 

name = ‘2‘;a = function(){    alert(this.name);    alert(888);},o =　{    fn1 : function(){            a = function(){             //fn1執行的時候（fn1要執行，不執行是加不進去的）把a加到window裡面去，把外部的a方法覆蓋了                alert(this.name);//2  window                alert(this);//2                alert(666);            };            a();//666  a.call(window)            window.a();//666    }}o.fn1();window.a();// 2   666

 

name = ‘2‘;a = function(){    alert(this.name);    alert(888);},o =　{    fn1 : function(){            this.a = function(){//fn1執行，給o對象加了a方法                alert(this.name);                 alert(this);                alert(666);            };            a(); //2   888    a.call(window)   ，都是從window中找a()沒有就報錯            window.a(); //2  888    }}o.fn1();window.a();// 2   888
o.a();//666

name = ‘2‘;a = function(){    alert(this.name);    alert(888);},o =　{    fn1 : function(){            var a = function(){ //fn1函數執行，就有2個a方法，一個在fn1局部範圍，一個在window                alert(this.name);                 alert(this);                alert(666);            };            a(); //2  666  a.call(window)，尋找局部範圍的a方法            window.a(); // 2  888    }}o.fn1();window.a();//  2   888

 

jquery js解析函數、函數直接調用