不知怎的,我认为"this"关键字没有支付参考价值.但是你知道我可以使用连续的if/else if语句,它会正常工作.例如,我可以用这种方式编写代码.
if(painStatus == 1) {
msg.innerHTML = "pain message 1";
}
else if(painStatus == 2) {
msg.innerHTML = "pain message 2";
}
等等,但是使用switch语句就失败了.我确信这很简单我做得不对.对不起是一个菜鸟.
<head>
<script type="text/javascript">
function painLevel(val) {
var painStatus = document.getElementById("pain_status").innerHTML = val;
var msg = document.getElementById("painMsg");
switch (painStatus) {
case 1:
msg.innerHTML = "Pain message 1";
break;
case 2:
msg.innerHTML = "Pain message 2";
break;
.
.
.
default:
msg.innerHTML = "";
}
}
</script>
</head>
<body>
<p>Please use the bar to select pain level</p>
<p>My Pain Level</p>
<input type = "range" min="0" max="10" value="1" onchange="painLevel(this.value)" />
Pain Level = <span id="pain_status">1</span>
<br /><br />
<div id="painMsg"> rePain message 1</div>
</body>
我相信你只需要像这样解析
switch (parseInt(painStatus)) {
// As before....
}
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