常见报错

// Uncaught SyntaxError: Unexpected token '<'
// for循环条件之间应该用分号分隔！
for (var i = 0, i< 5, i++) {
    console.log(i);
}

async function foo() {
    return 'hello world'
}
console.log(foo())  //Promise {<fulfilled>: undefined}
// Uncaught SyntaxError: missing ) after argument list
// 参数之间应该用逗号分隔！
foo().then(v => console.log(v); e => console.log(e))

console.log(a); //Uncaught ReferenceError: a is not defined
a = 10

var show = 10
show()      //Uncaught TypeError: show is not a function

var ajax = new Promise((resolve, reject) => {
    console.log('ajax');
    reject('no')    //Uncaught (in promise) no
})