Web Front-end
HTML Tutorial
Where should
I used to think that script can be placed anywhere in HTML. I corrected my misconception when I made a request today - the location of script is not random.
First of all, I want to implement a select tag with two options: yes and no. However, during initialization, the select tag is required to select a null value by default, so I added a method to let it change the null value when clicking. Delete:
<!DOCTYPE html>
<html>
<head>
<script src="jquery/jquery-1.11.1.min.js"></script>
</head>
<script>
$('#checkcash').click(function () {
if ($('#checkcash').val() == '0') {
$("#checkcash option[value='0']").remove();
}
});
$("#alert").click(function(){
alert("1123");
})
</script>
<body>
是否已提现 <select id="checkcash" style="width: 181px">
<option selected="selected" value="0"></option>
<option value="1">是</option>
<option value="2">否</option>
</select>
<input type='button' id='alert' value="anwo">
</body>
</html>But this does not achieve the desired effect. At first I thought it was a jquery syntax error and I kept checking and correcting it online, but it didn’t work. Then I suddenly thought about it. I should have put the script at the back and tried it. It turned out to be ok. Then I suddenly realized that it was not like this.
Later I checked the reason is because the html file is executed in a top-down manner, but the order of the imported css and javascript is different. When the css is introduced for execution and loading, the program The execution continues, and when the
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