这个全选为什么运行不了

Question

$("#checkall").click(function(){
for(var i=0;i<checkchoose.length;i++){
$(".tit").each(function(){
var s= Number(this.innerHTML)
if (s[i] !==0){
checkchoose[i].checked = this.checked
}else {
alert("不能全选")
}
})
}
})

Answer 1

$("#checkall").click(function () {
  $(".tit").each(function (i) {
    var s = Number(this.innerHTML);
    if (s[i] !== 0) {
      checkchoose[i].checked = this.checked;
    } else {
      alert("不能全选");
    }
  });
});