啥都不说了，直接上代码
1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 5 <title>无标题文档</title> 6 <script type="text/javascript" src="por.js"></script> 7 </head> 8 <body> 9 <div style="padding-top:20px;"> 10 <input placeholder="请输入你的姓名" type="text" /> 11 </div> 15 </body> 16 </html>
por.js
//placeholder IE8
var _placeholderSupport = function() {
var t = document.createElement("input");
t.type = "text";
return (typeof t.placeholder !== "undefined");
}();
window.onload = function() {
var arrInputs = document.getElementsByTagName("input");
for (var i = 0; i < arrInputs.length; i++) {
var curInput = arrInputs[i];
if (!curInput.type || curInput.type == "" || curInput.type == "text")
HandlePlaceholder(curInput);
}
};
function HandlePlaceholder(oTextbox) {
if (!_placeholderSupport) {
var curPlaceholder = oTextbox.getAttribute("placeholder");
if (curPlaceholder && curPlaceholder.length > 0) {
oTextbox.value = curPlaceholder;
oTextbox.setAttribute("old_color", oTextbox.style.color);
oTextbox.style.color = "#c0c0c0";
oTextbox.onfocus = function() {
this.style.color = this.getAttribute("old_color");
if (this.value === curPlaceholder)
this.value = "";
};
oTextbox.onblur = function() {
if (this.value === "") {
this.style.color = "#c0c0c0";
this.value = curPlaceholder;
}
}
}
}
}
不适合密码框 - -
原文地址：http://www.cnblogs.com/jiaweniv/p/4918055.html
时间： 2024-10-12 09:33:23