2019-09-16 input光标

1.设置input框默认光标位置

let temp = document.getElementById('temp')
window.addEventListener("keydown", (event) => {
    let keys = event.keyCode
    if(keys === 37){//Right
        xxxxx        
    }else if(keys === 39){//Left
       xxxxx
    }else if(keys === 9){//tab
        temp.setSelectionRange(0,0)
    }
})