100个不能错过的实用JS自定义函数

标签:关于我们    日期:2017-11-13 10:49    录入:汇盛国际平台    浏览:

  

[JS函数,js实用自定义函数]100个不能错过的实用JS自定义函数

  

1、原生JavaScript实现字符串长度截取  
代码如下:

  
function cutstr(str, len) {  
var temp;  
var icount = 0;  
var patrn = /[^\x00-\xff]/;  
var strre = "";  
for (var i = 0; i < str.length; i++) {  
if (icount < len - 1) {  
temp = str.substr(i, 1);  
if (patrn.exec(temp) == null) {  
icount = icount + 1  
} else {  
icount = icount + 2  
}  
strre += temp  
} else {  
break  
}  
}  
return strre + "..."  
}
  
2、原生JavaScript获取域名主机  
代码如下:
  
function getHost(url) {  
var host = "null";  
if(typeof url == "undefined"|| null == url) {  
url = window.location.href;  
}  
var regex = /^\w+\:\/\/([^\/]*).*/;  
var match = url.match(regex);  
if(typeof match != "undefined" && null != match) {  
host = match[1];  
}  
return host;  
}
  
3、原生JavaScript清除空格  
代码如下:
  
String.prototype.trim = function() {  
var reExtraSpace = /^\s*(.*?)\s+$/;  
return this.replace(reExtraSpace, "$1")  
}
  
4、原生JavaScript替换全部  
代码如下:
  
String.prototype.replaceAll = function(s1, s2) {  
return this.replace(new RegExp(s1, "gm"), s2)  
}
  
5、原生JavaScript转义html标签  
代码如下:
  
function HtmlEncode(text) {  
return text.replace(/&/g, '&').replace(/\"/g, '"').replace(//g, '>')  
}
  
6、原生JavaScript还原html标签  
代码如下:
  
function HtmlDecode(text) {  
return text.replace(/&/g, '&').replace(/"/g, '\"').replace(//g, '>')  
}
  
7、原生JavaScript时间日期格式转换  
代码如下:
  
Date.prototype.Format = function(formatStr) {  
var str = formatStr;  
var Week = ['日', '一', '二', '三', '四', '五', '六'];  
str = str.replace(/yyyy|YYYY/, this.getFullYear());  
str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));  
str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));  
str = str.replace(/M/g, (this.getMonth() + 1));  
str = str.replace(/w|W/g, Week[this.getDay()]);  
str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());  
str = str.replace(/d|D/g, this.getDate());  
str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());  
str = str.replace(/h|H/g, this.getHours());  
str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());  
str = str.replace(/m/g, this.getMinutes());  
str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());  
str = str.replace(/s|S/g, this.getSeconds());  
return str  
}
  
8、原生JavaScript判断是否为数字类型  
代码如下:
  
function isDigit(value) {  
var patrn = /^[0-9]*$/;  
if (patrn.exec(value) == null || value == "") {  
return false  
} else {  
return true  
}  
}
  
9、原生JavaScript设置cookie值  
代码如下:
  
function setCookie(name, value, Hours) {  
var d = new Date();  
var offset = 8;  
var utc = d.getTime() + (d.getTimezoneOffset() * 60000);  
var nd = utc + (3600000 * offset);  
var exp = new Date(nd);  
exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);  
document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"  
}
  
10、原生JavaScript获取cookie值  
代码如下:
  
function getCookie(name) {  
var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));  
if (arr != null) return unescape(arr[2]);  
return null   ★★★小编:汇盛国际注册 整理文章,欢迎大家转载 ★★★
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