网页中搜索框效果原理。
<title></title> <style type="text/css"> .Cls { width: 200px; } .ClsOutput { background-color: silver; font-style: italic; font-family: 楷体; } .ClsInput { background-color: white; } </style> </head> <body style="font-style: italic"> </body> </html> <script type="text/javascript"> var val = ‘请输入搜索内容‘; var Input = function () { this.className = ‘Cls ClsInput‘; this.value = ‘‘; this.backgroundColor = ‘white‘; }; var Output = function () { if (this.value == ‘‘) { this.className = ‘Cls ClsOutput‘; this.value = val; } }; window.onload = function () { var txt = document.createElement(‘input‘); //txt.type = ‘text‘; //txt.style.width = ‘100px‘; //txt.style.background = ‘gray‘; //txt.style.fontStyle = ‘italic‘; //txt.style.fontFamily = ‘楷体‘; txt.className = ‘Cls ClsOutput‘; txt.id = ‘Search‘; txt.value = val; txt.onfocus = Input; txt.onblur = Output; document.body.appendChild(txt); }; </script>
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