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November 14, 2013 17:12
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前端笔记之_js中this解析(未完待续,开坑待填)
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在一个function中this指什么? | |
其实this指的是拥有该function的对象。 | |
如果在一个html文档中直接声明一个function,那么它内部的this就是指向window。 | |
以下资料参考自quirksmode.org: | |
Examples - copying | |
this is written into the onclick method in the following cases: | |
element.onclick = doSomething | |
element.addEventListener('click',doSomething,false) | |
element.onclick = function () {this.style.color = '#cc0000';} | |
<element onclick="this.style.color = '#cc0000';"> | |
Examples - referring: | |
In the following cases this refers to the window: | |
element.onclick = function () {doSomething()} | |
element.attachEvent('onclick',doSomething) | |
<element onclick="doSomething()"> | |
资料参考自:http://www.quirksmode.org/js/this.html |
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