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javascript比较与精确比较

==在js中是判断相等而===在js是判断完全相等, 
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
</head>
<body>
<script type="text/网页特效">
var y = 5;
if(y == "5"){
document.write("== '5' true
");
}
else{
document.write("== '5' false
");
}
if(y == 5){
document.write("== 5 数字 is true
");
}
else{
document.write("== 5 数字 false
");
}
if( y === 5){
document.write("=== 数字5 is true
");
}
else{
document.write("=== 数字5 false
");
}
if(y === "5"){
document.write("=== 5 is true
");
}
else{
document.write("=== 5 is false
");
}
</script>
</body>
<html>
补充:网页制作,js教程 
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