jq回調函數第一版
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div class="div" style="width: 200px;height: 200px;background: red;"></div>
<script type="text/javascript" src="../js/jquery-1.12.4.js" ></script>
<script>
$(".div").on('click',function(){
auto(a);//參數就是個回調函數
});
/*點擊之后調用的函數*/
function auto(callback){
alert('1')
callback&&callback();
}
/*回調函數*/
function a(){
alert('我是點擊之后的回調函數')
}
</script>
</body>
</html>
jq回調函數第二版
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
.div {
width: 100px;
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<div class="div"></div>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
$(".div").on('click', function() {
a(b);
})
function a(callBack) {
$(".div").css('background', 'yellow')
/*重點 定時器加以區分*/
setTimeout(function() {
callBack && callBack();
}, 1000);
}
function b() {
$(".div").css('background', 'green')
}
</script>
</body>
</html>
jq一個函數執行完畢后再執行另一個函數利用返回值
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
.div {
width: 100px;
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<div class="div"></div>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
var off=false;
$(".div").on('click', function() {
console.log('a函數執行之前'+off+'')
a();
console.log('a函數執行完畢'+off+'')
if(off){
console.log('a函數執行完畢執行b函數'+off+'')
b();
}
})
function a() {
$(".div").css('background', 'yellow')
off=true;
}
function b() {
$(".div").css('background', 'green')
}
</script>
</body>
</html>