JavaScript中Global对象

1.escape函数

<script>
	document.write(escape("Hello World!!你好，世界！！"))
	document.write("<br/>");
	document.write(unescape("Hello%20World%21%21%u4F60%u597D%uFF0C%u4E16%u754C%uFF01%uFF01"))
</script>

 

2.parse与isNaN

<script>
		var str="3.3434";
		alert(parseInt(str));
		alert(parseFloat(str));
		alert(isNaN(str)); //是否是非数字
</script>

 

3.eval函数

<script>
		str="alert(\"Hello World\")";//执行一段代码
		eval(str);
</script>

 4.isFinite判断是否是无穷大

 

<script>
		alert(isFinite(123));
		alert(isFinite(123/0));
</script>

 

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