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  • 字符串trim()的使用

    示例一:

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    <head>
      <title>测试JS扩展方法</title>
      <script type="text/javascript">
        // 合并多个空白为一个空白
        String.prototype.ResetBlank = function() {    //对字符串扩展
          var regEx = /s+/g;
          return this.replace(regEx, ' ');
        };
     
        window.onload = function()
        {
          var str = "你   在他想还好吗?";
          alert(str);
          str = str.ResetBlank();    //这样就能够调用了,跟C#的很像吧!
          alert(str);
        }
      </script>
    </head>

    示例二:

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    // 清除两边的空格
    String.prototype.trim = function() {
      return this.replace(/(^s*)|(s*$)/g, '');
    };
    // 合并多个空白为一个空白
    String.prototype.ResetBlank = function() {
      var regEx = /s+/g;
      return this.replace(regEx, ' ');
    };
      
    // 保留数字
    String.prototype.GetNum = function() {
      var regEx = /[^d]/g;
      return this.replace(regEx, '');
    };
      
    // 保留中文
    String.prototype.GetCN = function() {
      var regEx = /[^u4e00-u9fa5uf900-ufa2d]/g;
      return this.replace(regEx, '');
    };
      
    // String转化为Number
    String.prototype.ToInt = function() {
      return isNaN(parseInt(this)) ? this.toString() : parseInt(this);
    };
      
    // 得到字节长度
    String.prototype.GetLen = function() {
      var regEx = /^[u4e00-u9fa5uf900-ufa2d]+$/;
      if (regEx.test(this)) {
        return this.length * 2;
      } else {
        var oMatches = this.match(/[x00-xff]/g);
        var oLength = this.length * 2 - oMatches.length;
        return oLength;
      }
    };
      
    // 获取文件全名
    String.prototype.GetFileName = function() {
      var regEx = /^.*/([^/?]*).*$/;
      return this.replace(regEx, '$1');
    };
      
    // 获取文件扩展名
    String.prototype.GetExtensionName = function() {
      var regEx = /^.*/[^/]*(.[^.?]*).*$/;
      return this.replace(regEx, '$1');
    };
      
    //替换所有
    String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) {
      if (!RegExp.prototype.isPrototypeOf(reallyDo)) {
        return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi" : "g")), replaceWith);
      } else {
        return this.replace(reallyDo, replaceWith);
      }
    };
    //格式化字符串 add By 刘景宁 2010-12-09 
    String.Format = function() {
      if (arguments.length == 0) {
        return '';
      }
      
      if (arguments.length == 1) {
        return arguments[0];
      }
      
      var reg = /{(d+)?}/g;
      var args = arguments;
      var result = arguments[0].replace(reg, function($0, $1) {
        return args[parseInt($1) + 1];
      });
      return result;
    };
      
    // 数字补零
    Number.prototype.LenWithZero = function(oCount) {
      var strText = this.toString();
      while (strText.length < oCount) {
        strText = '0' + strText;
      }
      return strText;
    };
      
    // Unicode还原
    Number.prototype.ChrW = function() {
      return String.fromCharCode(this);
    };
      
    // 数字数组由小到大排序
    Array.prototype.Min2Max = function() {
      var oValue;
      for (var i = 0; i < this.length; i++) {
        for (var j = 0; j <= i; j++) {
          if (this[i] < this[j]) {
            oValue = this[i];
            this[i] = this[j];
            this[j] = oValue;
          }
        }
      }
      return this;
    };
      
    // 数字数组由大到小排序
    Array.prototype.Max2Min = function() {
      var oValue;
      for (var i = 0; i < this.length; i++) {
        for (var j = 0; j <= i; j++) {
          if (this[i] > this[j]) {
            oValue = this[i];
            this[i] = this[j];
            this[j] = oValue;
          }
        }
      }
      return this;
    };
      
    // 获得数字数组中最大项
    Array.prototype.GetMax = function() {
      var oValue = 0;
      for (var i = 0; i < this.length; i++) {
        if (this[i] > oValue) {
          oValue = this[i];
        }
      }
      return oValue;
    };
      
    // 获得数字数组中最小项
    Array.prototype.GetMin = function() {
      var oValue = 0;
      for (var i = 0; i < this.length; i++) {
        if (this[i] < oValue) {
          oValue = this[i];
        }
      }
      return oValue;
    };
      
    // 获取当前时间的中文形式
    Date.prototype.GetCNDate = function() {
      var oDateText = '';
      oDateText += this.getFullYear().LenWithZero(4) + new Number(24180).ChrW();
      oDateText += this.getMonth().LenWithZero(2) + new Number(26376).ChrW();
      oDateText += this.getDate().LenWithZero(2) + new Number(26085).ChrW();
      oDateText += this.getHours().LenWithZero(2) + new Number(26102).ChrW();
      oDateText += this.getMinutes().LenWithZero(2) + new Number(20998).ChrW();
      oDateText += this.getSeconds().LenWithZero(2) + new Number(31186).ChrW();
      oDateText += new Number(32).ChrW() + new Number(32).ChrW() + new Number(26143).ChrW() + new Number(26399).ChrW() + new String('26085199682010819977222352011620845').substr(this.getDay() * 5, 5).ToInt().ChrW();
      return oDateText;
    };
    //扩展Date格式化
    Date.prototype.Format = function(format) {
      var o = {
        "M+": this.getMonth() + 1, //月份     
        "d+": this.getDate(), //日     
        "h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, //小时     
        "H+": this.getHours(), //小时     
        "m+": this.getMinutes(), //分     
        "s+": this.getSeconds(), //秒     
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度     
        "S": this.getMilliseconds() //毫秒     
      };
      var week = {
        "0": "u65e5",
        "1": "u4e00",
        "2": "u4e8c",
        "3": "u4e09",
        "4": "u56db",
        "5": "u4e94",
        "6": "u516d"
      };
      if (/(y+)/.test(format)) {
        format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
      }
      if (/(E+)/.test(format)) {
        format = format.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "u661fu671f" : "u5468") : "") + week[this.getDay() + ""]);
      }
      for (var k in o) {
        if (new RegExp("(" + k + ")").test(format)) {
          format = format.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        }
      }
      return format;
    }
    Date.prototype.Diff = function(interval, objDate) {
      //若参数不足或 objDate 不是日期类型則回传 undefined
      if (arguments.length < 2 || objDate.constructor != Date) { return undefined; }
      switch (interval) {
        //计算秒差                            
        case 's': return parseInt((objDate - this) / 1000);
          //计算分差
        case 'n': return parseInt((objDate - this) / 60000);
          //计算時差
        case 'h': return parseInt((objDate - this) / 3600000);
          //计算日差
        case 'd': return parseInt((objDate - this) / 86400000);
          //计算周差
        case 'w': return parseInt((objDate - this) / (86400000 * 7));
          //计算月差
        case 'm': return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1);
          //计算年差
        case 'y': return objDate.getFullYear() - this.getFullYear();
          //输入有误
        default: return undefined;
      }
    };
      
    //检测是否为空
    Object.prototype.IsNullOrEmpty = function() {
      var obj = this;
      var flag = false;
      if (obj == null || obj == undefined || typeof (obj) == 'undefined' || obj == '') {
        flag = true;
      } else if (typeof (obj) == 'string') {
        obj = obj.trim();
        if (obj == '') {//为空
          flag = true;
        } else {//不为空
          obj = obj.toUpperCase();
          if (obj == 'NULL' || obj == 'UNDEFINED' || obj == '{}') {
            flag = true;
          }
        }
      }
      else {
        flag = false;
      }
      return flag;
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  • 原文地址:https://www.cnblogs.com/jxl-blog/p/6618784.html
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