代码片段

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]/; // 匹配双字节字符(包括汉字在内) var strren = “”; 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; } } else { break; } } return strre + “…”;}

`2. 原生JavaScript获取域名主机function getHost(url) { var host = “null”; if (typeof url == undefined || url === null) { url = window.location.href; } var regex = /^\w+://([/])./; var match = url.match(regex); if (typeof match != undefined && match != null) { 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”);}
5. 原生JavaScript替换全部String.prototype.replaceAll = function(s1, s2) { return this.replace(new RegExp(s1, “gm”), s2);}
7. 原生JavaScript转义html标签function HtmlEncode(text) { return text.replace(/&/g, ‘&’) .replace(/"/g, ‘"’) .replace(//g, ‘>’);}
9. 原生JavaScript还原html标签function HtmlDecode(text) { return text.replace(’&’, /&/g) .replace(’"’, /"/g) .replace(’<’, //g);}
11. 原生JavaScript时间日期格式替换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.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 }