How do I call variable in function?

This question already has an answer here:

Javascript “this” pointer within nested function 7 answers

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Try by assigning this to a variable:

var XClass = function () {
    var that = this;
    this.dataMember = "hello world";

    $("div").on("click", "button", function() {
        console.log(that.dataMember); 
    });  
}

This way, that will refer to the current XClass object. Otherwise, inside a event handler callback, this refers to the object being clicked.

---

分配this变量：

var XClass = function () {
    var self = this;
    this.dataMember = "hello world";

    $("div").on("click", "button", function() {
        console.log(self.dataMember);   // no error 
    });  
}

---

使用bind来设置上下文

var XClass = function () {
    this.dataMember = "hello world";

    $("div").on("click", "button", function() {
        console.log(this.dataMember);   //error 
    }.bind(this));  
}

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