2015-10-12 ：
1、search()表达式:搜索索引
<!DOCTYPE html>
<html>
<body>
<p>搜索字符串 "w3cSchool", 并显示匹配的起始位置：</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
var str = "Visit W3cSchool!";
var n = str.search(/w3cSchool/i);
//var n = str.search("w3cSchool");//亦能达到同等效果
document.getElementById("demo").innerHTML = n;
}
</script>
</body>
</html>
2、replace()表达式：替换字符串
<!DOCTYPE html>
<html>
<body>
<p>替换 "microsoft" 为 "W3cSchool" :</p>
<button onclick="myFunction()">点我</button>
<p id="demo">Please visit Microsoft!</p>
<script>
function myFunction() {
var str = document.getElementById("demo").innerHTML;
var txt = str.replace(/microsoft/i,"W3cSchool");//replace("Microsoft", "w3cschool");亦能达到同样效果
document.getElementById("demo").innerHTML = txt;
}
</script>
</body>
</html>
3、使用 test()方法校验
<!DOCTYPE html>
<html>
<body>
<script>
var patt1=new RegExp("i");//校验是否包含 'i'
document.write(patt1.test("The best things in life are free"));验证字符，true或false
document.write(/e/.exec("The best things in life are free!"));//搜索该字符串，空则返回null
</script>
</body>
</html>
4、split()分割字符串对象
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to display the array values after the split.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var str="How are you doing today?";//要输出的内容
var n=str.split(",");//使用 str.split(" "); 输出效果为 'How,are,you,doing,today?'
document.getElementById("demo").innerHTML=n;替换内容
}
</script>
</body>
</html>
5、等于('==')和恒等于('===')区别
<!DOCTYPE html>
<html>
<body>
<p>x 赋值为5 , 显示比较后的值 (x === "5"):</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = 5;
document.getElementById("demo").innerHTML = (x === 5);//值和类型均相符，true
document.getElementById("demo").innerHTML = (x == '5');//值相符，true
}
</script>
</body>
</html>
6、表单验证大全
原作者 博客园 地址:
http://www.cnblogs.com/wzmaodong