A page has two buttons, each with an onclick event and a computed field.
页面有两个按钮，每个按钮有一个onclick事件和一个computed字段。
Lastly, a computed example is given.
最后给出一个计算例子。
Set a single property to a computed value, on all matched elements.
为所有匹配的元素设置一个计算的属性值。
Set a single property to a computed value, on all matched elements.
为所有匹配的元素设置一个计算的属性值。
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