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Update README.md
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README.md

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@@ -590,6 +590,26 @@ HTML5?
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原型链:
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通过自己的原型并向上寻找直到Object.prototype.__proto__; 这条链就是原型链。
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- 看看下面运行结果?
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```javascript
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window.onload=function(){
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var a=1+"1";
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var b="1"+1;
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var c="abc"+12+5+"def";
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var d="abc"+(12+5)+"def";
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console.log(a);
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console.log(b);
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console.log(c);
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console.log(d);
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}
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//结果
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11
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11
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abc125def
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abc17def
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```
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- eval是做什么的?
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