js binding event this points to a changed problem solution_javascript skills

The function can be extended as follows

Copy the code The code is as follows:

Function.prototype.bind = function(obj) {
var _this = this;
return function() {
_this.apply(obj,arguments);
}
}

The usage is as follows

Copy code The code is as follows:

var a = function(){
alert(this.title)
}.bind(document);
a();

is commonly used here

Copy the code The code is as follows:

function myalert() {
this.title = 'hello world';
this.init = function() {
$("#xxx").click(this.close.bind(this));
}
this.close = function() {
alert(this.title)
}
}

Copy code The code is as follows:

var a = new myalert();

a.init();