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| -rw-r--r-- | files/zh-cn/web/javascript/reference/operators/this/index.html | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/files/zh-cn/web/javascript/reference/operators/this/index.html b/files/zh-cn/web/javascript/reference/operators/this/index.html index a3378079ac..0962ff2a6e 100644 --- a/files/zh-cn/web/javascript/reference/operators/this/index.html +++ b/files/zh-cn/web/javascript/reference/operators/this/index.html @@ -129,19 +129,20 @@ new Bad(); // ReferenceError</pre> <h3 id="函数上下文中的_this">函数上下文中的 this</h3> -<pre dir="rtl">// An object can be passed as the first argument to call or apply and this will be bound to it. +<pre class="brush:js"> +// 对象可以作为 bind 或 apply 的第一个参数传递，并且该参数将绑定到该对象。 var obj = {a: 'Custom'}; -// We declare a variable and the variable is assigned to the global window as its property. +// 声明一个变量，并将该变量作为全局对象 window 的属性。 var a = 'Global'; function whatsThis() { - return this.a; // The value of this is dependent on how the function is called + return this.a; // this 的值取决于函数被调用的方式 } -whatsThis(); // 'Global' as this in the function isn't set, so it defaults to the global/window object -whatsThis.call(obj); // 'Custom' as this in the function is set to obj -whatsThis.apply(obj); // 'Custom' as this in the function is set to obj +whatsThis(); // 'Global' 因为在这个函数中 this 没有被设定，所以它默认为 全局/ window 对象 +whatsThis.call(obj); // 'Custom' 因为函数中的 this 被设置为obj +whatsThis.apply(obj); // 'Custom' 因为函数中的 this 被设置为obj </pre> <h3 id="this_和对象转换">this 和对象转换</h3> |