每天CookBook之JavaScript-002

和=的区别

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>001</title>
</head>
<body>
	
</body>
<script type="text/javascript">
var str1 = String("string");
var num1 = Number(1.45);
var bool1 = Boolean(true);

if(str1 === "string"){
	console.log('equal');
}

if(num1 === 1.45){
	console.log('equal');
}

if(bool1 === true){
	console.log('equal');
}

var str2 = new String("string");
var num2 = new Number(1.45);
var bool2 = new Boolean(true);

if(str2 === "string"){
	console.log('equal');
} else {
	console.log('not equal');
}

if(num2 === 1.45){
	console.log('equal');
} else {
	console.log('not equal');
}

if(bool2 === true){
	console.log('equal');
} else {
	console.log('not equal');
}

console.log(typeof num1);
console.log(typeof num2);
</script>
</html>
posted @ 2016-07-05 20:30  4Thing  阅读(72)  评论(0)  编辑  收藏  举报