解决js函数闭包内存泄露问题的办法

本文通过举例，由浅入深的讲解了解决js函数闭包内存泄露问题的办法，分享给大家供大家参考，具体内容如下

原始代码：

rush:js;"> function Cars(){ this.name = "Benz"; this.color = ["white","black"]; } Cars.prototype.sayColor = function(){ var outer = this; return function(){ return outer.color }; };

var instance = new Cars();
console.log(instance.sayColor()())

优化后的代码：

rush:js;"> function Cars(){ this.name = "Benz"; this.color = ["white","black"]; } Cars.prototype.sayColor = function(){ var outerColor = this.color; //保存一个副本到变量中 return function(){ return outerColor; //应用这个副本 }; outColor = null; //释放内存 };

var instance = new Cars();
console.log(instance.sayColor()())

稍微复杂一点的例子：

<div class="jb51code">
<pre class="brush:js;">
function inheritPrototype(subType,superType){
var prototype = Object(superType.prototype);
prototype.constructor = subType;
subType.prototype = prototype;
}

function Cars(){
this.name = "Benz";
this.color = ["white","black"];
}
Cars.prototype.sayColor = function(){
var outer = this;
return function(){
return outer.color;
};
};

function Car(){
Cars.call(this);
this.number = [321,32];
}
inheritPrototype(Car,Cars);
Car.prototype.sayNumber = function(){
var outer = this;
return function(){
return function(){
return outer.number[outer.number.length - 1];
}
};
};

var instance = new Car();
console.log(instance.sayNumber()()());