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characters

返回值:ArrayjQuery.grep(array, callback, [invert])

概述

使用過濾函數(shù)過濾數(shù)組元素。

此函數(shù)至少傳遞兩個(gè)參數(shù):待過濾數(shù)組和過濾函數(shù)。過濾函數(shù)必須返回 true 以保留元素或 false 以刪除元素。

參數(shù)

array,callback,[invert]Array,Function,BooleanV1.0

array:待過濾數(shù)組。

callback:此函數(shù)將處理數(shù)組每個(gè)元素。第一個(gè)參數(shù)為當(dāng)前元素,第二個(gè)參數(shù)而元素索引值。此函數(shù)應(yīng)返回一個(gè)布爾值。另外,此函數(shù)可設(shè)置為一個(gè)字符串,當(dāng)設(shè)置為字符串時(shí),將視為“l(fā)ambda-form”(縮寫形式?),其中 a 代表數(shù)組元素,i 代表元素索引值。如“a > 0”代表“function(a){ return a > 0; }”。

invert:如果 "invert" 為 false 或?yàn)樵O(shè)置,則函數(shù)返回?cái)?shù)組中由過濾函數(shù)返回 true 的元素,當(dāng)"invert" 為 true,則返回過濾函數(shù)中返回 false 的元素集。

示例

描述:

過濾數(shù)組中小于 0 的元素。

jQuery 代碼:
$.grep( [0,1,2], function(n,i){
  return n > 0;
});
結(jié)果:
[1, 2]

描述:

排除數(shù)組中大于 0 的元素,使用第三個(gè)參數(shù)進(jìn)行排除。

jQuery 代碼:
$.grep( [0,1,2], function(n,i){
  return n > 0;
}, true);
結(jié)果:
[0]
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