需要准备的材料分别有:电脑、html编辑器、浏览器。
1、首先,打开html编辑器,新建html文件,例如:index.html。
2、在index.html中的<script>标签,输入js代码:
var a = '2012-12-11'
var date1 = new Date(a.replace('-', '/'))
var t = date1.getTime() + 30 * 24 * 3600 * 1000
var date2 = new Date(t)
document.body.innerText = date2
3、浏览器运行index.html页面,此时打印出了2012-12-11加上30天的日期结果。
<html><script type="text/javascript">
function showNext(){
currentTime = document.getElementById("currentTime")
nextTime = document.getElementById("nextTime")
if(currentTime.value==""){
alert("please input current time!")
return
}
var currentTimeLength = currentTime.value.length
switch(currentTimeLength){
case 4:
inputText(goto4())
break
case 7:
inputText(goto7())
break
default:
break
}
}
function goto4(){
var NumberOfValue = parseInt(currentTime.value)
return NumberOfValue+1
}
function goto7(){
var numberOfValue = currentTime.value.split("-")
var month = parseInt(numberOfValue[1])
if(month==12){
var year = parseInt(numberOfValue[0])
return year+1+"-0"+1
}else{
return numberOfValue[0]+"-0"+(month+1)
}
}
function inputText(obj){
nextTime.value = obj
}
</script>
<body>
please input current time :<input type="text" id="currentTime"/></br>
<input type="button" value ="click to show next time" onclick="showNext()"/></br>
the next time is:<input type="text" id="nextTime"/>
</body>
</html>
刚写的测试通过。你试试。