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[每日一练]输入手机号码时的放大提示

常用功能,练练手。

<!DOCTYPE html PUBliC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><style type="text/css">#amplify{ width:145px; height:40px; text-align:center; font-size:18px; color:orange; background-color:#ffff99;}</style></head><body><div id="amplify"></div><input type="text" id="mobileNumber" maxlength="11" onkeyup="show()"/><script type="text/javascript">function show(){    var tmp=document.getElementById("mobileNumber").value,length=tmp.length,output=tmp;    if(length>3&&length<=7){        output=tmp.replace(/(^\d{3})/,"$1-");    }    else if(length>7){        output=tmp.replace(/(^\d{3})(\d{4})/,"$1-$2-");    }    document.getElementById("amplify").innerHTML=output;}</script></body></html>


效果图

[每日一练]输入手机号码时的放大提示