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在js对象中，这两种方法调用有啥区别吗？

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在js对象中，这两种方法调用有啥区别吗？

如图，this.sing 和this.sing() 有啥区别吗
image


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this.sing是指向这个函数而并没有执行
this.sing()是执行这个函数
this.sing(){}是定义这个函数也没有执行


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