Can jquery traverse array array?

青灯夜游
Release: 2021-11-16 14:06:38
Original
2344 people have browsed it

jquery can traverse the array array. Methods: 1. Use the for loop statement to traverse the array; 2. Use the "for in" loop statement to traverse the array; 3. Use the forEach() method to traverse the array; 4. Use each( ) method to traverse the array; 5. Use the map() method to traverse the array.

Can jquery traverse array array?

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

jquery traverses array array

1. for loop:

var arr = new Array(13.5,3,4,5,6);
for(var i=0;i<arr.length><p>2. for in loop: </p><pre class="brush:js;toolbar:false;">var x
var mycars = new Array()
mycars[0] = "Saab"
mycars[1] = "Volvo"
mycars[2] = "BMW"
for (x in mycars)
{
  document.write(mycars[x] + "<br />")
}
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3. forEach Method traversal

<script>
	var arr = [1,3,5,7,9];
	var obj = {0:1,1:3,2:5,3:7,4:9};
	/**
	*利用原生JS的forEach方法遍历
	*第一个参数:遍历到的元素
	*第二个参数:当前遍历到的索引
	*注意:原生的forEach方法只能遍历数组,而不能遍历伪数组
	*/
	arr.forEach(function(value,index){
		console.log("原生forEach遍历数组:",index,value);
	});
	/**
	obj.forEach(function(value,index){
		console.log("原生forEach遍历伪数组:",index,value);
		//Uncaught TypeError: obj.forEach is not a function
	});
	*/

</script>
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Can jquery traverse array array?

4, each() traverses the array

<script>
	var arr = [1,3,5,7,9];
	var obj = {0:1,1:3,2:5,3:7,4:9};

	/**
	* 利用jQuery的each静态方法遍历
	* 第一个参数:当前遍历到的索引
	* 第二个元素:遍历到的元素
	* 注意:jQuery的each方法可以遍历伪数组
	*/
	$.each(arr,function(index,value){
		console.log("jQuery-each方法遍历数组:",index,value);
	})
	$.each(obj,function(index,value){
		console.log("jQuery-each方法遍历伪数组:",index,value);
	})
</script>
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Can jquery traverse array array?

##5, map() traverses Array

<script>
	var arr = [1,3,5,7,9];
	var obj = {0:1,1:3,2:5,3:7,4:9};
	/**
	*1.利用原生JS的map方法遍历 
	*第一个参数:遍历到的元素
	*第二个参数:当前遍历到的索引
	*第三个参数:当前被遍历的数组
	*注意:和原生的forEach方法一样,不能遍历伪数组
	*/
	arr.map(function(value,index,array){
		console.log("原生map遍历数组:",index,value,array);
	});
	/**
	obj.map(function(value,index,array){
		console.log("原生map遍历伪数组:",index,value,array);
		//Uncaught TypeError: obj.forEach is not a function
	});
	*/

	/**
	* 2.利用jQuery的each静态方法遍历
	* 第一个参数:要遍历的数组
	* 每遍历一个元素之后执行的回调函数
	* 回调函数的参数:
	* 	第一个参数:遍历到的元素
	* 	第二个元素:当前遍历到的索引
	* 注意:和jQuery的each方法一样可以遍历伪数组
	*/
	$.map(arr,function(value,index){
		console.log("jQuery-map方法遍历数组:",index,value);
	})
	$.map(obj,function(value,index){
		console.log("jQuery-map方法遍历伪数组:",index,value);
	})
</script>
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Can jquery traverse array array?

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