错误捕获

[MengZhaoFly]

try catch

只能捕获同步代码

window.onerror

window.onerror = function (msg, url, row, col, error) {
        console.log("我已经捕获到错误");
        console.log(msg, url, row, col, error);
        return true;
    }

1. onerror用来捕获意料之外的错误
2. try--catch 意料之内的错误
3. 返回true 异常才会向上抛出
4. 当遇到静态资源错误，无法捕获

资源错误：window.addEventListener("error")

addEventListener("unhandledrejection")

捕获 promise reject

node

// 捕获错误
process.on('uncaughtException', err => {
    //do something
})
// promise
process.on('unhandledRejection', err => {
    //do something
})