JS 中try用法

const a = null

try {
    const b = JSON.parse(a)
    console.log(a.name)
} catch (e) {
    console.log("发生异常:" + e)
}
这个是系统抛出的异常

下面这个是自定义的异常

·const a = 1

·try {
···if (a == 2 || a == 3) {
···throw 'hahaha'
·} else {
···console.log(a)
··}
·} catch (e) {
···console.log("发生异常:" + e)
·}

 

 throw 得内容会在catch里面返回出来 也类似于return