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Usage example of map function traversing array in jquery_jquery

WBOY
WBOYOriginal
2016-05-16 15:58:251154browse

The example in this article describes the use of map function in jquery to traverse arrays. Share it with everyone for your reference. The details are as follows: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>map函数</title>
<script src="jquery-1.6.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
/*注意map函数不能处理json格式对象的数组。*/
$(function () {
  var arr = [3, 6, 9];
  ShowArray(arr);
  //调用jquery的map方法  用来将一个数组，转成另一个数组
  //var arrChange = $.map(arr, function (item) { return item * 2; });
  //ShowArray(arrChange);
  //调用自己实现的mymap方法，达到和jquery的map方法一样的功能
  var myfunc = function (item) { return item * 2 };
  var arrChange = MyMap(arr, myfunc);
  ShowArray(arrChange);
});
//自己实现一个类似jquery的map方法
function MyMap(arr, func) {
  var newArray = new Array(arr.length);
  for (var i = 0; i < arr.length; i++) {
    newArray[i] = func(arr[i]);
  }
  return newArray;
}
function ShowArray(arr) {
  var output = "";
  for (var i = 0; i < arr.length; i++) {
    if (output == "") {
      output = arr[i];
    }
    else {
      output += "," + arr[i];
    }
  }
  alert(output);
}
</script>
</head>
<body>
</body>
</html>

I hope this article will be helpful to everyone’s jQuery programming.

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