html代码如下:
<div class="field"></div>
<div class="field"></div>
<div class="field"></div>
js代码如下:
<script>
function X1(className){return document.getElementsByClassName(className)};
var cover=document.createElement("div");
var fieldArr=X1("field");
for (var i=0;i<fieldArr.length;i++){
fieldArr[i].addEventListener("mouseover",addCover,false);
function addCover(this){
this.appendChild(cover);
}
}
</script>
我试图用this定位,但是提示Unexpected token this
可我又不想用id定位,请问如何实现。
addEventListener的第二个参数不能传参的
this
是关键字, 不能用于参数名. 且这里也不需要用它来当参数名.
<div class="field">1</div>
<div class="field">2</div>
<div class="field">3</div>
<script>
function X1(className){return document.getElementsByClassName(className)};
var cover=document.createElement("div");
cover.innerHTML = 'cover';
var fieldArr=X1("field");
for (var i=0;i<fieldArr.length;i++){
fieldArr[i].addEventListener("mouseover",addCover,false);
}
function addCover(){
this.appendChild(cover);
}
</script>