原生JavaScript技巧大收集(1~10)

1、原生JavaScript实现字符串长度截取

01	function cutstr(str, len) {

02

var temp;

03	var icount = 0;

04	var patrn = /[^\x00-\xff]/;

05	var strre = "";

06	for (var i = 0; i < str.length; i++) {

07	if (icount < len - 1) {

08	temp = str.substr(i, 1);

09	if (patrn.exec(temp) == null) {

10	icount = icount + 1

11

} else {

12	icount = icount + 2

13

}

14	strre += temp

15

} else {

16

break

17

}

18

}

19	return strre + "..."

20

}

2、原生JavaScript获取域名主机

01	function getHost(url) {

02	var host = "null";

03	if(typeof url == "undefined"|| null == url) {

04	url = window.location.href;

05

}

06	var regex = /^\w+\:\/\/([^\/]*).*/;

07	var match = url.match(regex);

08	if(typeof match != "undefined" && null != match) {

09	host = match[1];

10

}

11	return host;

12

}

3、原生JavaScript清除空格

1	String.prototype.trim = function() {

2	var reExtraSpace = /^\s*(.*?)\s+$/;

3	return this.replace(reExtraSpace, "$1")

4

}

4、原生JavaScript替换全部

1	String.prototype.replaceAll = function(s1, s2) {

2	return this.replace(new RegExp(s1, "gm"), s2)

3

}

5、原生JavaScript转义html标签

1	function HtmlEncode(text) {

2	return text.replace(/&/g, '&amp').replace(/\"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;')

3

}

6、原生JavaScript还原html标签

1	function HtmlDecode(text) {

2	return text.replace(/&amp;/g, '&').replace(/&quot;/g, '\"').replace(/&lt;/g, '<').replace(/&gt;/g, '>')

3

}

7、原生JavaScript时间日期格式转换

01	Date.prototype.Format = function(formatStr) {

02	var str = formatStr;

03	var Week = ['日', '一', '二', '三', '四', '五', '六'];

04	str = str.replace(/yyyy|YYYY/, this.getFullYear());

05	str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));

06	str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));

07	str = str.replace(/M/g, (this.getMonth() + 1));

08	str = str.replace(/w|W/g, Week[this.getDay()]);

09	str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());

10	str = str.replace(/d|D/g, this.getDate());

11	str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());

12	str = str.replace(/h|H/g, this.getHours());

13	str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());

14	str = str.replace(/m/g, this.getMinutes());

15	str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());

16	str = str.replace(/s|S/g, this.getSeconds());

17	return str

18

}

8、原生JavaScript判断是否为数字类型

1	function isDigit(value) {

2	var patrn = /^[0-9]*$/;

3	if (patrn.exec(value) == null || value == "") {

4	return false

5

} else {

6	return true

7

}

8

}

9、原生JavaScript设置cookie值

1	function setCookie(name, value, Hours) {

2	var d = new Date();

3	var offset = 8;

4	var utc = d.getTime() + (d.getTimezoneOffset() * 60000);

5	var nd = utc + (3600000 * offset);

6	var exp = new Date(nd);

7	exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);

8	document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"

9

}

10、原生JavaScript获取cookie值

1	function getCookie(name) {

2	var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));

3	if (arr != null) return unescape(arr[2]);

4	return null

5

}