Javascript中call的应用

Javascript中call的使用

貌似理解了?http://hszy00232.blog.163.com/blog/static/43022753201131835653841/

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6.不错，接下来再理解一个怪异的形式

示例10：

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function flower(){    this.pollen="花粉";this.petal=function(){//花瓣console.log("leaf and bud"+this.pollen);};}function flower2(){}var seed=new flower();var seed2=new flower2();var tree={};//小蜜蜂call花flower花flower2种子seed种子seed2树tree//盛开的花朵this花粉pollen花瓣petalconsole.log(flower.call(tree),tree,"例1");//call把flower的this里面的pollen和petal都洒在了tree上了tree={};console.log(seed.petal(),seed,"例2+例3");//call把flower的this里面的pollen和petal都洒在了seed上了console.log(flower.call(seed2),seed2,"例4+例5");//call把flower的this里面的pollen和petal都洒在了flower2的seed2上了console.log(flower.call(flower2),"例6");//call把flower的this里面的pollen和petal都洒在了flower2上了，但是被flower巨大的花朵this挡住了，一般人看不见只能摸摸看了seed2=new flower2();console.log(seed.petal.call(seed2),seed2,"例7+例8");//call把seed的petal的this中的东东(好像什么都没有啊！！)洒在了seed2中，（真的饿什么都没有）console.log(flower.call.call(flower2)===flower2.call(null),"例9");//正在flower采蜜的call呼叫call，也就是call.call(flower2)=flower2.call()写道