ȫһṩ̡̳ѧϰѧϰƽ̨

JavaScriptѧϰ֮ʲôַjsַ֪ʶ

ҳıʾdzıԣͨʹWeb磺űԡؽӿڡȣԴǿҳıάWeb̵ĻҲ˵άǽڳı֮ϵġı֮ԳΪıԣΪıаνӡ㡣
ƪ¾͸ҴJavaScriptѧϰ֮ʲôַjsַ֪ʶܡһIJοֵҪѿԲοһ£ϣ

JavaScript ַ

JavaScriptַڴ洢ʹı

ַԴ洢һϵַ"HAHA"

ַǿԲ뵽еκַʹõţҲʹ˫š

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>Insert title here</title>
	</head>
	<body>
    <span id="demo"></span>
    <button onclick='this.innerHTML=Date()'>ʱ</button>
	</body>
	<script type="text/javascript">
    var stringa = "";    var stringb = 'ã㻵û';
	</script>
</html>

ʹλַеÿַ

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <span id="demo"></span>
    <button onclick='this.innerHTML=Date()'>ʱ</button>
</body>
<script type="text/javascript">
    var stringa = "";    
    var stringb = 'ã㻵û';    //ַͨеÿַ    
    alert(stringb[3]);
</script>
</html>

ַеǴ0ʼģҲ˵һֵַ[0],ڶ[1],Դơ

ַʹţַеŲҪַͬ

 <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <span id="demo"></span>
    <button onclick='this.innerHTML=Date()'>ʱ</button>
</body>
<script type="text/javascript">
    var stringa = "'dd'";
    var stringb = 'ã"㻵"û';
    //ַͨеÿַ
    alert(stringb[3]);
</script>
</html>

Ҳַתַʹ \ תַ

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <span id="demo"></span>
    <button onclick='this.innerHTML=Date()'>ʱ</button>
</body>
<script type="text/javascript">
    var stringa = "\'dd\'";
    var stringb = 'ã\"㻵\"û';
    //ַͨеÿַ
    alert(stringb[3]);
</script>
</html>

ַ

ʹ length ַijȣ

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <span id="demo"></span>
    <button onclick='this.innerHTML=Date()'>ʱ</button>
</body>
<script type="text/javascript">
    var stringa = "\'dd\'";
    var stringb = 'ã\"㻵\"û';
    //ַͨеÿַ
    alert(stringb.length);//鿴ַstringbij
</script>
</html>

ַ

JavaScriptַдڵŻ˫С

ҪȻַ޷ _ "۹""ôô"

ôأʹתַͺˣ_ "۹\"\"ôô"

\ תַǽַתΪַַϸ±

JavaScriptѧϰ֮ʲôַjsַ֪ʶ

ַǶ

ͨJavaScriptַԭʼֵʹַvar aa= "AA";

ҲʹnewؼַֽΪһvar stringaa = new String("Ȼ");

һ㲻鴴String󣬻ӰִٶȣܲӰ졣

var aa = "AA";
var bb = new String("AA");
alert(aa === bb); //ֵfalse    Ϊ  aaַ   bb Ƕ

ַԺͷ

ԭʼֵַûԺͷΪDzǶ

ԭʼֵַʹJavaScriptԺͷΪJavaScriptִзʱ԰ԭʼֵ

ַ

JavaScriptѧϰ֮ʲôַjsַ֪ʶ

ַ

JavaScriptѧϰ֮ʲôַjsַ֪ʶ

ܽ᣺ϾDZƪĵȫݣϣܶԴҵѧϰؽ̳JavaScriptƵ̳jQueryƵ̳bootstrap̳

ϾJavaScriptѧϰ֮ʲôַjsַ֪ʶܵϸݣעphp£


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