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                ## `with`優化 > * 盡可能地少用`with`語句,因為它會增加`with`語句以外的數據的訪問代價。 > * 避免使用`with` > > > > > `with`語句將一個新的可變對象推入作用域鏈的頭部,函數的所有局部變量現在處于第二個作用域鏈對象中,從而使局部變量的訪問代價提高。 > > > > ~~~ > var person = { > name: “Nicholas", > age: 30 > } > function displayInfo() { > var count = 5; > with (person) { > alert(name + ' is ' + age); > alert( 'count is ' + count); > } > } > ~~~
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