好用的技术教程:http://www.w3school.com.cn/index.html

1:正则表达式

正则表达式通常用于验证表单

定义语法为 / /

2:Date对象

var now = new Date();以及很多的tostring方法

3:function对象 arguments对象,用于实现JavaScript的重载

在JavaScript中,如果方法名相同,只能执行最后定义的方法,因为在JavaScript中,方法可以用

var myMethod = function(n);

var myMethod = function(n,m);

方法的本质是变量,所以,只能保存最后一次定义的方法;

通过function和arguments对象的组合,实现类似于Java的方法重载:

function myMethod(){
if(arguments.length ==1){
var n = parseInt(arguments[0]);
alert(n*n);
}
else {
if(arguments.length ==2){
var n = parseInt(arguments[0]);
var m = parseInt(arguments[1]);
alert(n,m);
}
}
}

全局函数:不需要对象的函数

服务器的编码和解码:

<script>
var str ="我爱小逗比" ;
document.write("<h1>str="+str+"</h1>");
str= encodeURI(str);
document.write("<h1>encodeURI:str="+str+"</h1>");
str= decodeURI(str);
document.write("<h1>decodeURI:str="+str+"</h1>");
</script>

实验现象:

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" alt="" width="764" height="112" />

函数eval()用于计算字符串

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>计算器</title>
<script src="计算器.js"></script>
</head> <body>
<input type="text" id="txtData" readonly="readonly"/>
</br>
<input type="button" value="1" onclick="calc(this.value)"/>
<input type="button" value="2" onclick="calc(this.value)"/>
<input type="button" value="3" onclick="calc(this.value)"/>
</br>
<input type="button" value="4" onclick="calc(this.value)"/>
<input type="button" value="5" onclick="calc(this.value)"/>
<input type="button" value="6" onclick="calc(this.value)"/>
</br>
<input type="button" value="7" onclick="calc(this.value)"/>
<input type="button" value="8" onclick="calc(this.value)"/>
<input type="button" value="9" onclick="calc(this.value)"/>
</br>
<input type="button" value="+" onclick="calc(this.value)"/>
<input type="button" value="-" onclick="calc(this.value)"/>
<input type="button" value="=" onclick="calc(this.value)"/>
<input type="button" value="c" onclick="calc(this.value)"/> </body>
</html>

JavaScript:

// JavaScript Document
function calc(str){
var txtObj = document.getElementById("txtData");
switch(str){
case "c":
txtObj.value = " ";
break;
case "=":
var input = txtObj.value;
if(input.length>0)
try{
var r=eval(input);
txtObj.value=txtObj.value+"=";
txtObj.value +=+r;
}
catch(error){
alert("不符合算术规则");
} break;
default:
txtObj.value +=str; break;
}
}

代码效果:

aaarticlea/png;base64,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" alt="" />

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