function getRandom(start, end, fixed = 0) {
let differ = end - start
let random = Math.random()
return (start + differ * random).toFixed(fixed)
}getRandom(1,5) 1<= num >=5
document.addEventListener("paste", function (event) {
var isChrome = false;
if (event.clipboardData || event.originalEvent) {
//某些chrome版本使用的是event.originalEvent
var clipboardData =
event.clipboardData || event.originalEvent.clipboard...