32个可以直接拿来使用的js

1、原生 JavaScript 实现字符串长度截取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 猎取域名主机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String.prototype.trim = function() { var reExtraSpace = /^\s*(.*?)\s+$/; return this.replace(reExtraSpace, "$1")}4、原生 JavaScript 替换全部String.prototype.replaceAll = function(s1, s2) { return this.replace(new RegExp(s1, "gm"), s2) }5、原生 JavaScript 转义 html 标签function HtmlEncode(text) { return text.replace(/&/g, '&').replace(/\"/g, '"').replace(//g, '>') }6、原生 JavaScript 还原 html 标签function HtmlDecode(text) { return text.replace(/&/g, '&').replace(/"/g, '\"').replace(//g, '>') }7、原生 JavaScript 时间日期格式转换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.get...