最常用的javascript方法函数
字符串长度截取
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | function cutstr(str, len) { var temp, icount = 0, patrn = /[^\x00-\xff]/, 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 + "..." } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 | 1 字符串长度截取 function cutstr(str, len) { var temp, icount = 0, patrn = /[^\x00-\xff]/, 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 替换全部 String.prototype.replaceAll = function (s1, s2) { return this .replace( new RegExp(s1, "gm" ), s2) } 3 清除空格 String.prototype.trim = function () { var reExtraSpace = /^\s*(.*?)\s+$/; return this .replace(reExtraSpace, "$1" ) } 4 清除左空格/右空格 function ltrim(s){ return s.replace( /^(\s*| *)/, "" ); } function rtrim(s){ return s.replace( /(\s*| *)$/, "" ); } 5 判断是否以某个字符串开头 String.prototype.startWith = function (s) { return this .indexOf(s) == 0 } 6 判断是否以某个字符串结束 String.prototype.endWith = function (s) { var d = this .length - s.length; return (d >= 0 && this .lastIndexOf(s) == d) } 7 转义html标签 function HtmlEncode(text) { return text.replace(/&/g, '&' ).replace(/\ "/g, '" ').replace(/</g, '<' ).replace(/>/g, '>' ) } 8 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 .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 } 9 判断是否为数字类型 function isDigit(value) { var patrn = /^[0-9]*$/; if (patrn.exec(value) == null || value == "" ) { return false } else { return true } } 10 设置cookie值 function setCookie(name, value, Hours) { var d = new Date(); var offset = 8; var utc = d.getTime() + (d.getTimezoneOffset() * 60000); var nd = utc + (3600000 * offset); var exp = new Date(nd); exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000); document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;" } 11 获取cookie值 function getCookie(name) { var arr = document.cookie.match( new RegExp( "(^| )" + name + "=([^;]*)(;|$)" )); if (arr != null ) return unescape(arr[2]); return null } 12 加入收藏夹 function AddFavorite(sURL, sTitle) { try { window.external.addFavorite(sURL, sTitle) } catch (e) { try { window.sidebar.addPanel(sTitle, sURL, "" ) } catch (e) { alert( "加入收藏失败,请使用Ctrl+D进行添加" ) } } } 13 设为首页 function setHomepage() { if (document.all) { document.body.style.behavior = 'url(#default#homepage)' ; document.body.setHomePage( 'http://w3cboy.com' ) } else if (window.sidebar) { if (window.netscape) { try { netscape.security.PrivilegeManager.enablePrivilege( "UniversalXPConnect" ) } catch (e) { alert( "该操作被浏览器拒绝,如果想启用该功能,请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true" ) } } var prefs = Components.classes[ '@mozilla.org/preferences-service;1' ].getService(Components.interfaces.nsIPrefBranch); prefs.setCharPref( 'browser.startup.homepage' , 'http://w3cboy.com' ) } } 14 加载样式文件 function LoadStyle(url) { try { document.createStyleSheet(url) } catch (e) { var cssLink = document.createElement( 'link' ); cssLink.rel = 'stylesheet' ; cssLink.type = 'text/css' ; cssLink.href = url; var head = document.getElementsByTagName( 'head' )[0]; head.appendChild(cssLink) } } 15 返回脚本内容 function evalscript(s) { if (s.indexOf( '<script' ) == -1) return s; var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig; var arr = []; while (arr = p.exec(s)) { var p1 = /<script[^\>]*?src=\ "([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i; var arr1 = []; arr1 = p1.exec(arr[0]); if(arr1) { appendscript(arr1[1], '', arr1[2], arr1[3]); } else { p1 = /<script(.*?)>([^\x00]+?)<\/script>/i; arr1 = p1.exec(arr[0]); appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1); } } return s; } 16 清除脚本内容 function stripscript(s) { return s.replace(/<script.*?>.*?<\/script>/ig, ''); } 17 动态加载脚本文件 function appendscript(src, text, reload, charset) { var id = hash(src + text); if(!reload && in_array(id, evalscripts)) return; if(reload && $(id)) { $(id).parentNode.removeChild($(id)); } evalscripts.push(id); var scriptNode = document.createElement(" script "); scriptNode.type = " text/javascript "; scriptNode.id = id; scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset); try { if(src) { scriptNode.src = src; scriptNode.onloadDone = false; scriptNode.onload = function () { scriptNode.onloadDone = true; JSLOADED[src] = 1; }; scriptNode.onreadystatechange = function () { if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) { scriptNode.onloadDone = true; JSLOADED[src] = 1; } }; } else if(text){ scriptNode.text = text; } document.getElementsByTagName('head')[0].appendChild(scriptNode); } catch(e) {} } 18 返回按ID检索的元素对象 function $(id) { return !id ? null : document.getElementById(id); } 19 跨浏览器绑定事件 function addEventSamp(obj,evt,fn){ if(!oTarget){return;} if (obj.addEventListener) { obj.addEventListener(evt, fn, false); }else if(obj.attachEvent){ obj.attachEvent('on'+evt,fn); }else{ oTarget[" on " + sEvtType] = fn; } } 20 跨浏览器删除事件 function delEvt(obj,evt,fn){ if(!obj){return;} if(obj.addEventListener){ obj.addEventListener(evt,fn,false); }else if(oTarget.attachEvent){ obj.attachEvent(" on " + evt,fn); }else{ obj[" on" + evt] = fn; } } |
1 2 3 4 5 6 7 8 | //得到一个对象的所有style样式 function getClass(ele, attr) { if ( typeof getComputedStyle== 'function' ) { return getComputedStyle(ele, null )[attr] } else { return ele.currentStyle[attr]; } } |
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步
· Linux glibc自带哈希表的用例及性能测试
· 深入理解 Mybatis 分库分表执行原理
· 如何打造一个高并发系统?
· .NET Core GC压缩(compact_phase)底层原理浅谈
· 现代计算机视觉入门之:什么是图片特征编码
· 手把手教你在本地部署DeepSeek R1,搭建web-ui ,建议收藏!
· Spring AI + Ollama 实现 deepseek-r1 的API服务和调用
· 数据库服务器 SQL Server 版本升级公告
· C#/.NET/.NET Core技术前沿周刊 | 第 23 期(2025年1.20-1.26)
· 程序员常用高效实用工具推荐,办公效率提升利器!
2014-07-27 JsRender系列demo(7)compline
2014-07-27 JsRender系列demo(6)-无名
2014-07-27 JsRender系列demo(5) for else
2014-07-27 JsRender系列demo(4)-if else
2014-07-27 JsRender系列demo(3)-自定义容器
2014-07-27 JsRender系列demo(2)多模板-template
2014-07-27 JsRender系列demo(1)-insert-data