ECMAScript5 之Array

Posted 2020-07-07

ES5新增了写数组的方法：forEach、map、filter、some、every、indexOf、lastIndexOf、reduce、reduceRight
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forEach

forEach：遍历，循环数组

var arr=[1,2,3,4];
arr.forEach(alert);
/*等同于for循环*/
for(var i=0;i<arr.length;i++){
	alter(arr[i]);
}

map

filter

some

every

indexOf

lastIndexOf

reduce

reduceRight