try语句:测试代码块的错误
catch语句:处理错误
thow语句:创建自定义错误
例子:
function myFunction() {
var message, x;
message = document.getElementById("message");
message.innerHTML = "";
x = document.getElementById("demo").value;
try {
if(x == "") throw "值为空";
if(isNaN(x)) throw "不是数字";
x = Number(x);
if(x < 5) throw "太小";
if(x > 10) throw "太大";
}
catch(err) {
message.innerHTML = "错误: " + err;
}
}
JavaScript调试工具
(1)console.log();
(2)设置断点
(3)debugger关键字
(4)浏览器调试工具
JavaScript错误和JavaScript调试
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转载自blog.csdn.net/u012149906/article/details/81099207
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