JavaScript中的if ... else if ...语句是什么?
if...elseif...语句是if...else的高级形式,它使JavaScript可以从多个条件中做出正确的决定。
语法
if-else-if语句的语法如下-
if (expression 1){
Statement(s) to be executed if expression 1 is true
}
else if (expression2){
Statement(s) to be executed if expression 2 is true
}
else if (expression3){
Statement(s) to be executed if expression 3 is true
}
else{
Statement(s) to be executed if no expression is true
}示例
您可以尝试运行以下命令,以了解如何使用if…elseif语句在JavaScript中进行处理-
<html>
<body>
<script>
var book= "maths";
if( book== "history" ){
document.write("<b>History Book</b>");
}
else if(book == "maths" ){
document.write("<b>Maths Book</b>");
}
else if(book == "economics" ){
document.write("<b>EconomicsBook</b>");
}
else{
document.write("<b>Unknown Book</b>");
}
</script>
</body>
<html>热门推荐
10 读书祝福语女生短句简短
11 感谢同事新婚祝福语简短
12 感谢教官文案祝福语简短
13 员工聚会蛋糕祝福语简短
14 元宵发客户祝福语简短
15 给团队信心祝福语简短
16 医美的祝福语大全简短
17 异国姻缘的祝福语简短
18 兄妹拍照祝福语简短的话