简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
javascript - I don't know much about JS. Ask a code question
phpcn_u1582
phpcn_u1582 2017-05-19 10:31:31
0
4
515

After returning false, will all the following codes not be executed? Why does bbb still pop up when the button is clicked when the length is greater than 7? 

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script type="text/javascript">
        window.onload=function(){
            var oIpt1=document.getElementById('ipt1');
            var oBtn1=document.getElementById('btn1');
            oIpt1.onblur=function(){
                if(oIpt1.value.length>7){
                    alert('aaa');
                    return false;
                }
            }
            oBtn1.onclick=function(){
                alert('bbb');
            }
        }
    </script>
</head>
<body>
<input id="ipt1"></input>
<button id="btn1">提交</button>
</body>
</html>
phpcn_u1582
phpcn_u1582

reply all(4)
滿天的星座
滿天的星座2017-05-19 10:33:31 4 floor

return false is to jump out of the current function oIpt1.onblur and does not affect the execution of the external oBtn1.onclick function

Like +0
Add Reply
伊谢尔伦
伊谢尔伦2017-05-19 10:33:31 3 floor

That is the code after the current method will not be executed...

Like +0
Add Reply
小葫芦
小葫芦2017-05-19 10:33:31 2 floor

This is bound to the blur event. It has nothing to do with being bound to the click event

Like +0
Add Reply
刘奇
刘奇2017-05-19 10:33:31 1 floor

Define a variable to the outer function while returning. The internal one is false and the external one also changes to false. That’s OK

Like +0
Add Reply
Popular Topics
More>
Popular Articles
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！