jQuery遍历的几种方式

jQuery对象遍历

	<script type="text/javascript" src="js/jquery-3.4.1.js">script>
	<script>
		var cities = ["深圳市","广州市","珠海市","上海市","北京市"];
		//jQuery对象调用遍历
		$(cities).each(function(i,n) {
			console.log(i+" = "+n);
		});
	script>

jQuery函数调用

<script>
	//jQuery函数调用
	$.each(cities,function(i,n) {
		console.log(i+" > "+n);
	});
script>

纯JavaScript实现

<script>
		var cities = ["深圳市","广州市","珠海市","上海市","北京市"]
		
		function callback(i,n) {
			console.log("123：" + i + n);
		}

		function foreach(array,callback) {
			for (var i = 0; i < array.length; i++) {
				var item = array[i];
				callback(i,item);
			}
		}
		//调用
		foreach(cities,callback);
	</script>