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1.return
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>函数传参</title>
</head>
<body>
<script type="text/javascript">
function sum(a,b){
return a+b;
}
alert(sum(6,7);
</script>
</body>
</html>
函数传参
----------------
arguments
------可变参 不定参
arguments 传参求和
fuction sum(){
var result=0;
for(var i=0; i<arguments.length;i++){
reslut+=arguments[i];
}
return result;
}
alert(sum(4,5,4));
--------------------------
css(oDiv ,'width')
<DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>arguments</title>
</head>
<style>
#div1{
100px;
height:100px;
background:red;
}
</style>
<body>
<script type="text/javascript">
function css(object,name,value){
if(arguments.length==2){
return object.style[name];
}
else{
object.style[name]=value;
}
}
window.onload=function(){
var oDiv=document.getElementsById('div1');
css(oDiv,'background','green');
//alert(css(oDiv,'width'));
}
</script>
<div id="div1"></div>
</body>
</html>
第二种方法写
取非行间样式
currentStyle
<style>
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById("div1");
alert("oDiv.currentStyle.width);
}
</script>
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