本文實例講述了js常見遍歷操作。分享給大家供大家參考，具體如下：
for循環
var a = new Array("first", "second", "third") for(var i = 0;i < a.length; i++) {document.write(a[i]+",");}for in
var arr = new Array("first", "second", "third") for(var item in arr) {document.write(arr[item]+",");}for each
<button onclick="numbers.forEach(myFunction)">點我</button><p id="demo"></p><script>demoP = document.getElementById("demo");var numbers = [4, 9, 16, 25];function myFunction(item, index) { demoP.innerHTML = demoP.innerHTML + "index[" + index + "]: " + item + "<br>"; }</script>var arr = [1,2,3,4];arr.forEach(function(value,index,array){ array[index] == value; //結果為true sum+=value; });console.log(sum); //結果為 10each
$.each([],function(index,value,array){ //code something })map
[].map(function(value,index,array){ //code})希望本文所述對大家JavaScript程序設計有所幫助。
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