Date 日期格式化

  1 <span id="time"></span>
  2  <script>
  3 
  4 //名称：日期加法函数
  5 //参数：part(year、month、day、hour、minute、second、millisecond)
  6 //返回：Date对象
  7 Date.prototype.add = function (part, value) {
  8     if (!value || isNaN(value)) value = 0;
  9     switch (part) {
 10         case "year":
 11             this.setFullYear(this.getFullYear() + value);
 12             break;
 13         case "month":
 14             this.setMonth(this.getMonth() + value);
 15             break;
 16         case "day":
 17             this.setDate(this.getDate() + value);
 18             break;
 19         case "hour":
 20             this.setHours(this.getHours() + value);
 21             break;
 22         case "minute":
 23             this.setMinutes(this.getMinutes() + value);
 24             break;
 25         case "second":
 26             this.setSeconds(this.getSeconds() + value);
 27             break;
 28         case "millisecond":
 29             this.setMilliseconds(this.getMilliseconds() + value);
 30             break;
 31         default:
 32     }
 33     return this;
 34 };
 35 
 36 Date.prototype.addYears = function (value) {
 37     if (!value || isNaN(value)) value = 0;
 38     this.setFullYear(this.getFullYear() + value);
 39     return this;
 40 };
 41 
 42 Date.prototype.addMonths = function (value) {
 43     if (!value || isNaN(value)) value = 0;
 44     this.setMonth(this.getMonth() + value);
 45     return this;
 46 };
 47 
 48 Date.prototype.addDays = function (value) {
 49     if (!value || isNaN(value)) value = 0;
 50     this.setDate(this.getDate() + value);
 51     return this;
 52 };
 53 
 54 Date.prototype.addHours = function (value) {
 55     if (!value || isNaN(value)) value = 0;
 56     this.setHours(this.getHours() + value);
 57     return this;
 58 };
 59 
 60 Date.prototype.addMinutes = function (value) {
 61     if (!value || isNaN(value)) value = 0;
 62     this.setMinutes(this.getMinutes() + value);
 63     return this;
 64 };
 65 
 66 Date.prototype.addSeconds = function (value) {
 67     if (!value || isNaN(value)) value = 0;
 68     this.setSeconds(this.getSeconds() + value);
 69     return this;
 70 };
 71 
 72 Date.prototype.addMilliseconds = function (value) {
 73     if (!value || isNaN(value)) value = 0;
 74     this.setMilliseconds(this.getMilliseconds() + value);
 75     return this;
 76 };
 77 
 78 //名称：日期加法函数
 79 //参数：time(日期字符串，示例：12:00:00)
 80 //返回：Date对象
 81 Date.prototype.addTime = function (time) {
 82     var timeRegex = /^([0-1]?d|2[0-3])(:[0-5]?d){1,2}$/g;
 83     if (timeRegex.test(time)) {
 84         var value = Date.parse("1970/1/1 " + time) - Date.parse("1970/1/1");
 85         this.setMilliseconds(this.getMilliseconds() + value);
 86     }
 87     return this;
 88 };
 89 
 90 //名称：日期格式化函数
 91 //参数：format(示例：yyyy-MM-dd hh:mm:ss)、zeroize(是否补零)
 92 //返回：日期字符串
 93 Date.prototype.toCustomString = function (format, zeroize) {
 94     if (!zeroize) zeroize = false;
 95     var dy = this.getFullYear();
 96     var dM = this.getMonth() + 1;
 97     var dd = this.getDate();
 98     var dh = this.getHours();
 99     var dm = this.getMinutes();
100     var ds = this.getSeconds();
101     var dS = this.getMilliseconds();
102     var orm = {
103         "y+": dy.toString(),
104         "M+": !zeroize ? dM.toString() : dM < 10 ? '0' + dM : dM.toString(),
105         "d+": !zeroize ? dd.toString() : dd < 10 ? '0' + dd : dd.toString(),
106         "h+": !zeroize ? dh.toString() : dh < 10 ? '0' + dh : dh.toString(),
107         "m+": !zeroize ? dm.toString() : dm < 10 ? '0' + dm : dm.toString(),
108         "s+": !zeroize ? ds.toString() : ds < 10 ? '0' + ds : ds.toString(),
109         "S": dS.toString()
110     };
111     for (var i in orm) {
112         var patt = new RegExp(i);
113         if (patt.test(format)) {
114             var item = orm[i];
115             var ms = format.match(patt);
116             var result = ms[0];
117             if (i === "S") {
118                 format = format.replace(result, item);
119             } else {
120                 format = format.replace(result, item.substr(item.length - result.length));
121             }
122         }
123     }
124     return format;
125 };
126 window.onload = function(){
127     var time = document.getElementById("time");
128      
129     setInterval('time.innerText = new Date().toCustomString("yyyy-MM-dd hh:mm:ss")',1000);
130 
131 }
132 
133 </script>

没有格式啥的要求的话，就用Date下的toLocaleString()显示年月日时间或者toLocaleDateString()显示年月日

1 <span id="time"></span>
2  <script>
3  var time = document.getElementById("time");
4  setInterval('time.innerHTML = new Date().toLocaleString()', 1000);
5 </script>