原生JavaScript技巧大收集(1~10)
2024-10-18 23:32:46
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, "$1") |
4 |
} |
4、原生JavaScript替换全部
1 |
String.prototype.replaceAll = function(s1, s2) { |
2 |
return this.replace(new RegExp(s1, "gm"), s2) |
3 |
} |
5、原生JavaScript转义html标签
1 |
function HtmlEncode(text) { |
2 |
return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g, '<').replace(/>/g, '>') |
3 |
} |
6、原生JavaScript还原html标签
1 |
function HtmlDecode(text) { |
2 |
return text.replace(/&/g, '&').replace(/"/g, '\"').replace(/</g, '<').replace(/>/g, '>') |
3 |
} |
7、原生JavaScript时间日期格式转换
01 |
Date.prototype.Format = function(formatStr) { |
02 |
var str = formatStr; |
03 |
var Week = ['日', '一', '二', '三', '四', '五', '六']; |
04 |
str = str.replace(/yyyy|YYYY/, this.getFullYear()); |
05 |
str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100)); |
06 |
str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1)); |
07 |
str = str.replace(/M/g, (this.getMonth() + 1)); |
08 |
str = str.replace(/w|W/g, Week[this.getDay()]); |
09 |
str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate()); |
10 |
str = str.replace(/d|D/g, this.getDate()); |
11 |
str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours()); |
12 |
str = str.replace(/h|H/g, this.getHours()); |
13 |
str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes()); |
14 |
str = str.replace(/m/g, this.getMinutes()); |
15 |
str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds()); |
16 |
str = str.replace(/s|S/g, this.getSeconds()); |
17 |
return str |
18 |
} |
8、原生JavaScript判断是否为数字类型
1 |
function isDigit(value) { |
2 |
var patrn = /^[0-9]*$/; |
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 |
} |
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