<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div>我的爱人</div>
<div class="myClass">div</div>
<p class="myClass" id="myClass">p</p>
</body>
<script>
function getClass(className){
var bqAll=document.getElementsByClassName;
if(bqAll){
return document.getElementsByClassName(className)
}
var arr=[];
var dom=document.getElementsByTagName("*");
for(var i=0;i<dom.length;i++){
var classArray=dom[i].className.split(" ");
for(var j=0;j<classArray.length;j++){
if(classArray[j]==className){
arr.push(dom[i]);
}
}
}
return arr;
}
function $(str){
var s=str.charAt(0);//存放符号
var ss=str.substr(1);//存放元素的id名或类名
switch(s){
case "#":
alert("封装");
return document.getElementById(ss);
break;
case ".":
alert("类="+document.getElementsByClassName(ss)[0]);
return document.getElementsByClassName(ss)[0];
break;
default:
alert("str="+document.getElementsByTagName(str)[0]);
return document.getElementsByTagName(str)[0];
}
}
// $("p").innerHTML="我的p元素";
// $("#myClass").style.backgroundColor="red";
$(".myClass").style.color="blue";
</script>
</html>
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