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non1 遍历

2024-08-10 20:30:47   210人阅读

1.

var arr = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘]for (var i = 0, l = arr.length; i < l; i++) {    console.log(i, arr[i])}

 输出：

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2.

var arr = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘]for (var l = arr.length; l--;) {    console.log(l, arr[l])}

输出： 

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var arr = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘]for (var l = arr.length; l--;) {    arr.splice(l, 1)}console.log(arr) // []

 

 

3.

var arr = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘]var l = arr.lengthwhile(l--) {    console.log(l, arr[l])}

输出： 

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4. ES5

var arr = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘]arr.forEach(function(value, index, array) {    console.log(index, value, array)})

 输出：

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5. Underscore.js

<script src="http://www.mamicode.com/underscore.js"></script><script>    var list = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘]    _.each(list, function(element, index, list) {        console.log(element, index, list, this)    }, list)    _.each({one: 1, two: 2, three: 3}, function(value, key, list) {        console.log(value, key, list)    })</script>

输出：

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6. jQuery

<script src="http://www.mamicode.com/jquery-1.10.2.js"></script><script>    var list = [‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘]    $.each(list, function(index, value) {        console.log(index, value)    })    $.each({one: 1, two: 2, three: 3}, function(key, value) {        console.log(key, value)    })</script>

输出：

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non1 遍历


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