Magie! js + CSS + DIV zum Erlernen von Textfarbverlaufseffekten_Javascript-Kenntnissen

Das Beispiel in diesem Artikel zeigt den durch DIV+CSS+JS erzielten Textfarbverlaufseffekt als Referenz. Der spezifische Inhalt ist wie folgt

Das Folgende ist Teil des CSS-Codes:

<!--CSS代码开始-->
body{
 font:12px/1.5 Microsoft Yahei;
}
h3{
 padding:10px;
 margin:0;
 background-color:#999;
 color:#fff;
 font:16px/1.5 Microsoft Yahei;
 text-align:center;
}
.box{
 position:relative;
 background-color:#fff;
 width:auto;
 margin:0 auto;
 padding:0 30px;
 font:700 20px/1.5 "Microsoft Yahei",Microsoft Yahei;
 border-top:1px dashed #ccc;
 border-bottom:1px dashed #ccc;
 height:30px;
 margin-top:8px;
}
.box a{
 position:absolute;
 font-style:normal;
 white-space:nowrap;
}
.f999{
 color:#999;
}

Das Folgende ist der DIV-Teilecode:

<!--DIV代码开始-->
<div style="width:400px;margin:200px auto;background-color:#f2f2f2;border: 1px dashed #ccc;">
<h3><strong>CSS多彩渐变字</strong></h3>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
 <tr>
  <td height="10" colspan="2" align="center"></td>
  </tr>
 <tr>
  <td width="19%" height="30" align="right">文字：</td>
  <td width="81%"><input name="text" type="text" id="ctext" size="30" maxlength="16" style="font:12px Microsoft Yahei" value="请在此输入您需要生成渐变色的文字" onkeyup="setDiv()" /></td>
 </tr>
 <tr>
  <td height="30" align="right">R值：</td>
  <td><select name="Rvalue" style="font:12px Microsoft Yahei" id="rvalue"></select>
  <span class="f999">RGB颜色中的R值（0-255）</span></td>
 </tr>
 <tr>
  <td height="30" align="right">G值：</td>
  <td><select name="Gvalue" style="font:12px Microsoft Yahei" id="gvalue"></select>
   <span class="f999">RGB颜色中的G值（0-255）</span></td>
 </tr>
 <tr>
  <td height="30" align="right">B值：</td>
  <td><select name="Bvalue" style="font:12px Microsoft Yahei" id="bvalue"></select>
   <span class="f999">RGB颜色中的B值（0-255）</span></td>
 </tr>
 <tr>
  <td height="30" align="right">渐变方式：</td>
  <td><select name="ctype" style="font:12px Microsoft Yahei" id="ctype"><option value="0">灰度渐变</option><option value="1" selected="selected">变化R值</option><option value="2">变化G值</option><option value="3">变化B值</option></select>
  <span class="f999">相应的数值会强制在0~255之间变化</span></td>
 </tr>
</table>
<div class="box" id="box"></div>
<br />
  <button onclick="javascript:createData()">OK，上色！</button>
<br />
 
</div>

Das Folgende ist Teil des JavaScript-Codes:

// JavaScript代码开始
var rs = document.getElementById("rvalue");
var gs = document.getElementById("gvalue");
var bs = document.getElementById("bvalue");
function init(){
 var str;
 for(var i=0;i<=255;i++){
 var opr = document.createElement("option");
 var opg = document.createElement("option");
 var opb = document.createElement("option");
 opr.innerHTML = i;
 opg.innerHTML = i;
 opb.innerHTML = i;
 switch(i){
  case 100:opb.selected="selected";break;
  case 200:opg.selected="selected";break;
 }
 gs.appendChild(opg);
 rs.appendChild(opr);
 bs.appendChild(opb);
 }
 setDiv();
}
function setDiv(){
 var font = document.getElementById("ctext").value;
 var dObj = document.getElementById("box");
 dObj.innerHTML=font;
}
function createData(){
 var font = document.getElementById("ctext").value;
 var r = rs.options[rs.selectedIndex].text;
 var g = gs.options[gs.selectedIndex].text;
 var b = bs.options[bs.selectedIndex].text;
 var type = document.getElementById("ctype").value;
 if(font==""||font=="undefined"){
 font="文字不能为空，使用默认文字";
 document.getElementById("ctext").value = font;
 }
 colorful('box',font,r,g,b,type);
}
function colorful(obj,font,r,g,b,type){
 var boxObj;
 if(typeof(obj)=="string"||typeof(obj)=="number"){
 boxObj = document.getElementById(obj);
 }else{
 boxObj = obj;
 }
 boxObj.innerHTML="<a href='#'>"+font+"";
 var num = boxObj.getElementsByTagName("a")[0].scrollWidth;
 boxObj.innerHTML="";
 for(var i=0;i<=num;i++){
 var j=i+1;
 var c=Math.round(255/num*i);
 switch(Number(type)){

  case 0:r=c;g=c;b=c;break;
  case 1:r=c;break;
  case 2:g=c;break;
  case 3:b=c;break;
 }
 var iObj = document.createElement("A");
 iObj.innerHTML=font;
 iObj.style.clip="rect(auto "+j+"px auto "+i+"px)";
 iObj.style.color="rgb("+r+","+g+","+b+")";
 //iObj.href="#"; // 生成的文字超链接
 boxObj.appendChild(iObj);
 }
}
init();

Rendering:

Vollständiger Code:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>DIV+CSS+JS实现色彩渐变字体</title>
<style type="text/css">
body{font:12px/1.5 Microsoft Yahei;}
h3{padding:10px;margin:0;background-color:#999;color:#fff;font:16px/1.5 Microsoft Yahei;text-align:center;}
.box{position:relative;background-color:#fff;width:auto;margin:0 auto;padding:0 30px;font:700 20px/1.5 "Microsoft Yahei",Microsoft Yahei;border-top:1px dashed #ccc; border-bottom:1px dashed #ccc;height:30px;margin-top:8px;}
.box a{position:absolute;font-style:normal;white-space:nowrap;}
.f999{color:#999;}
a:link{text-decoration:none;}
a:hover{text-decoration:underline;}
a:visited{text-decoration:none;}
</style>
</head>
<body>
<div style="width:400px;margin:200px auto;background-color:#f2f2f2;border: 1px dashed #ccc;">
<h3><strong>CSS多彩渐变字</strong></h3>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
 <tr>
  <td height="10" colspan="2" align="center"></td>
  </tr>
 <tr>
  <td width="19%" height="30" align="right">文字：</td>
  <td width="81%"><input name="text" type="text" id="ctext" size="30" maxlength="16" style="font:12px Microsoft Yahei" value="请在此输入您需要生成渐变色的文字" onkeyup="setDiv()" /></td>
 </tr>
 <tr>
  <td height="30" align="right">R值：</td>
  <td><select name="Rvalue" style="font:12px Microsoft Yahei" id="rvalue"></select>
  <span class="f999">RGB颜色中的R值（0-255）</span></td>
 </tr>
 <tr>
  <td height="30" align="right">G值：</td>
  <td><select name="Gvalue" style="font:12px Microsoft Yahei" id="gvalue"></select>
   <span class="f999">RGB颜色中的G值（0-255）</span></td>
 </tr>
 <tr>
  <td height="30" align="right">B值：</td>
  <td><select name="Bvalue" style="font:12px Microsoft Yahei" id="bvalue"></select>
   <span class="f999">RGB颜色中的B值（0-255）</span></td>
 </tr>
 <tr>
  <td height="30" align="right">渐变方式：</td>
  <td><select name="ctype" style="font:12px Microsoft Yahei" id="ctype"><option value="0">灰度渐变</option><option value="1" selected="selected">变化R值</option><option value="2">变化G值</option><option value="3">变化B值</option></select>
  <span class="f999">相应的数值会强制在0~255之间变化</span></td>
 </tr>
</table>
<div class="box" id="box"></div>
<br />
    <button onclick="javascript:createData()">OK，上色！</button>
<br />
 
</div>
<script type="text/javascript">
var rs = document.getElementById("rvalue");
var gs = document.getElementById("gvalue");
var bs = document.getElementById("bvalue");
function init(){
 var str;
 for(var i=0;i<=255;i++){
 var opr = document.createElement("option");
 var opg = document.createElement("option");
 var opb = document.createElement("option");
 opr.innerHTML = i;
 opg.innerHTML = i;
 opb.innerHTML = i;
 switch(i){
  case 100:opb.selected="selected";break;
  case 200:opg.selected="selected";break;
 } 
 gs.appendChild(opg);
 rs.appendChild(opr);
 bs.appendChild(opb);
 }
 setDiv();
}
function setDiv(){
 var font = document.getElementById("ctext").value;
 var dObj = document.getElementById("box");
 dObj.innerHTML=font;
}
function createData(){
 var font = document.getElementById("ctext").value;
 var r = rs.options[rs.selectedIndex].text;
 var g = gs.options[gs.selectedIndex].text;
 var b = bs.options[bs.selectedIndex].text;
 var type = document.getElementById("ctype").value;
 if(font==""||font=="undefined"){
 font="文字不能为空，使用默认文字";
 document.getElementById("ctext").value = font;
 }
 colorful('box',font,r,g,b,type);
}
function colorful(obj,font,r,g,b,type){
 var boxObj;
 if(typeof(obj)=="string"||typeof(obj)=="number"){
 boxObj = document.getElementById(obj);
 }else{
 boxObj = obj;
 }
 boxObj.innerHTML="<a href='#'>"+font+"</a>";
 var num = boxObj.getElementsByTagName("a")[0].scrollWidth;
 boxObj.innerHTML="";
 for(var i=0;i<=num;i++){
 var j=i+1;
 var c=Math.round(255/num*i);
 switch(Number(type)){
  case 0:r=c;g=c;b=c;break;
  case 1:r=c;break;
  case 2:g=c;break;
  case 3:b=c;break;
 }
 var iObj = document.createElement("A");
 iObj.innerHTML=font;
 iObj.style.clip="rect(auto "+j+"px auto "+i+"px)";
 iObj.style.color="rgb("+r+","+g+","+b+")";
 //iObj.href="#"; // 生成的文字超链接
 boxObj.appendChild(iObj);
 }
}
init();
</script>
</body>
</html>

Das Obige ist der gesamte Inhalt dieses Artikels. Ich hoffe, er wird für das Studium aller hilfreich sein.