JQuery二级联动（ each(callback)，$.each(object, [callback])）

╰半夏微凉° 2022-04-22 02:30 174阅读 0赞

1.each(callback)

HTML 代码:

jQuery 代码:

$("img").each(function(i){
       this.src = "test" + i + ".jpg";
     });

结果:

[ <img src="test0.jpg" />, <img src="test1.jpg" /> ]

<!DOCTYPE html>
    <html>
    
    	<head>
    		<meta charset="UTF-8">
    		<title>使用jQuery完成省市二级联动</title>
    	
    
    		<script type="text/javascript" src="../js/jquery-1.8.3.js"></script>
    		<script>
    			$(function() {
    				var cities = new Array(3);
    				cities[0] = new Array("武汉市", "黄冈市", "襄阳市", "荆州市");
    				cities[1] = new Array("长沙市", "郴州市", "株洲市", "岳阳市");
    				cities[2] = new Array("石家庄市", "邯郸市", "廊坊市", "保定市");
    				cities[3] = new Array("郑州市", "洛阳市", "开封市", "安阳市");
    				$("#province").change(function() {
    					$("#city").empty();
    					var val = this.value;
    					$(cities).each(function(i) {
    						//alert(i+":"+n);
    						if (val == i) {
    							$(cities[i]).each(function(j) {
    								var textNode = document.createTextNode(cities[i][j]);
    								var opEle = document.createElement("option");
    								$(opEle).append(textNode);
    								$(opEle).appendTo($("#city"));
    							});
    						}
    					});
    				});
    			});
    		</script>
    
    	</head>
    
    	<body>
    		<select id="province">
    			<option>--请选择--</option>
    			<option value="0">湖北</option>
    			<option value="1">湖南</option>
    			<option value="2">河北</option>
    			<option value="3">河南</option>
    		</select>
    		<select id="city">
    									
    		</select>
    
    	</body>
    
    </html>

2. $.each(object, \[callback\])