javascript - 提示不工作

Question

我的代码在 var myAge (第一行)的某个地方有问题。我已加载浏览器，但无法打开提示窗口。对代码有什么问题有什么想法吗？

 <script>
var myAge = parseInt( prompt("enter your age", 30), 10 );

if (myAge >= 0 && myAge <= 10) {
    document.write("myAge is between 0 and 10 <br/>");
}

if ( !(myAge >= 0 && myAge <= 10) {
    document.write("myAge is NOT between 0 and 10 <br/>");  
}

if (myAge >= 80 || myAge <= 10) {
    document.write("myAge is 80 or above OR 10 or below.<br/>");    
}

if ( (myAge >= 30 && myAge <= 39) || (myAge >= 80 && myAge <= 89) ) {
    document.write("myAge is between 30 and 39 and 39 or myAge is " + "between 80 and 88"); 
}
</script>

Answer 1

您错过了第二个 if block 中的括号......同时关闭脚本标记。

var myAge = parseInt( prompt("enter your age", 30), 10 );

if (myAge >= 0 && myAge <= 10) {
    document.write("myAge is between 0 and 10 <br/>");
}

if ( !(myAge >= 0 && myAge <= 10)) {
    document.write("myAge is NOT between 0 and 10 <br/>");  
}

if (myAge >= 80 || myAge <= 10) {
    document.write("myAge is 80 or above OR 10 or below.<br/>");    
}

if ( (myAge >= 30 && myAge <= 39) || (myAge >= 80 && myAge <= 89) ) {
    document.write("myAge is between 30 and 39 and 39 or myAge is " + "between 80 and 88"); 
}