For loop 错误,因为使用var关键字代替let let calculator=(函数() { let screen=document.querySelector('.screen'); 设btns=document.queryselectoral('.butn');
错误,因为使用var关键字代替letFor loop 错误,因为使用var关键字代替let let calculator=(函数() { let screen=document.querySelector('.screen'); 设btns=document.queryselectoral('.butn');,for-loop,var,let,For Loop,Var,Let,错误,因为使用var关键字代替let let calculator=(函数() { let screen=document.querySelector('.screen'); 设btns=document.queryselectoral('.butn'); 让btnEqual=document.querySelector('.btn-equal'); 让btnClear=document.querySelector('.btn clear'); 这是什么语言? let calculator=(f
let calculator=(函数()
{
let screen=document.querySelector('.screen');
设btns=document.queryselectoral('.butn');
让btnEqual=document.querySelector('.btn-equal');
让btnClear=document.querySelector('.btn clear');
这是什么语言?
let calculator=(function()
{
let screen=document.querySelector('.screen');
let btns=document.querySelectorAll('.butn');
let btnEqual=document.querySelector('.btn-equal');
let btnClear=document.querySelector('.btn-clear');
for(let j=0;j<btns.length;j++)
{
btns[j].addEventListener('click',function()
{
let number=btns[j].getAttribute('data-num');
screen.textContent+=number;
});
};
btnEqual.addEventListener('click',function()
{
let value=eval(screen.textContent);
screen.textContent=value;
});
btnClear.addEventListener('click',function()
{
screen.textContent="";
});
})();