Why do the use of conditional judgments => and >= in JavaScript produce different results?

Question

'use strict';
var arr = ['Bart', 'Lisa', 'Adam'];
var len = arr.length-1;
while(len> =0){
alert('Hello,' arr[len]);
len--;
}//This will pop up normally, and it will stop after popping up after 3 times.

'use strict';
var arr = ['Bart', 'Lisa', 'Adam'];
var len = arr.length-1;
while(len= >0){
alert('Hello,' arr[len]);
len--;
}//After 3 normal pop-ups, many Hellos will pop up, undefined , and then the browser crashes.

Why is this happening?

Answer 1

I’m on my knees...

>=是大于等于运算符，=>那是ES6的箭头函数操作符啊，而且你还加了'use strict', the proper native ES6 has started...

Answer 2

Arrow function

Answer 3

>=大于等于 和 <=小于等于
=>这个是箭头函数 ()=>{}

Answer 4

The problem with JS parsing, => is the arrow function

Answer 5

Being hit by the perfect hit I mentioned before, it’s hard to tell whether it’s >=, <=, =>, =<

Answer 6

There are still so many tricks in js, and I accidentally forget that I am writing code