全国统一服务热线:400-633-9193

javascript字体颜色控件的开发 JS实现字体控制

    网络     2017-12-21    1412

我们在用JS写程序的时候,经常会遇到像在程序中直接控制字体的大小颜色等基本信息,尤其的在后台方便,小编测试用javascript写了一个这个控件,喜欢的拿走吧。

以上就是用JS写的运行效果,一下我们来看看代码具体实现方式:

知识点:for循环语句,字符串方法,进制转换,this指向问题,变量,数组方法,基本事件处理等。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
<!doctype html><!--声明html版本编写指令 H5-->
<html>
  <head>
    <!--声明页面编码 uft-8 国际编码-->
    <meta charset="UTF-8">
    <!--网站三要素 关键字 页面描述 标题-->
    <meta name="Keywords" content="">
    <meta name="Description" content="">
    <title>Document</title>
    <style type="text/css">
    *{margin:0px;padding:0px;font-family:"微软雅黑";}
  #box{width:400px;
    height:450px;
    background:#000;
    margin:50px auto;
    border:5px
solid #000;
    border-radius:5px;
    }
  #show{width:100%;
     height:190px;
     background:#00ccff;
     line-height:200px;
     font-size:8px;
     font-weight:bold;
     text-align:center;
     border-radius:5px;
    }
  #font ul{margin-left:10px;
      margin-top:30px;}
  #font ul li{width:380px;
        height:50px;
        list-style-type:none;
        color:#ddd;}
  #font ul li span{display:block;
          width:50px;
          height:50px;
          line-height:50px;
          text-align:right;
          float:left;
          }
  #font ul li .roll{width:290px;
          height:50px;
          float:left;
          line-height:50px;
          padding-left:30px;
          }
  #font ul li .roll .move{width:200px;
              height:12px;
              display:inline-block;
              background:#fff;
              margin-left:15px;
              margin-right:15px;
              border-radius:10px;
              background-size:cover;
              border:1px solid #fff;
              position:relative;
              }
  #font ul li .roll .move .prog{position:absolute;
                top:0px;
                width:0px;
                height:12px;
                border-radius:10px 0 0 10px;
                background:url("images/slider-bar.png") bottom;}
  #font ul li .roll .move .prog .but{width:22px;
                   height:22px;
                   position:absolute;
                   top:-3px;
                   background:url("images/dot-bg.png") no-repeat;
                   cursor:pointer;
                   left:0px;}
    </style>
  </head>
  <body>
  <div id="box">
    <div id="show">云烟好帅啊</div>
    <div id="font">
      <ul>
        <li>
          <span>字号</span>
          <div class="roll">
            8
              <div class="move">
                <div class="prog">
                  <div class="but"></div>
                </div>
              </div>
            40px
          </div>
        </li>
        <li>
          <span>颜色R</span>
          <div class="roll">
            0
              <div class="move">
                <div class="prog">
                  <div class="but"></div>
                </div>
              </div>
            255
          </div>
        </li>
        <li>
          <span>G</span>
          <div class="roll">0
              <div class="move">
                <div class="prog">
                  <div class="but"></div>
                </div>
              </div>
            255
          </div>
        </li>
        <li>
          <span>B</span>
          <div class="roll">
          0
<div class="move">
                <div class="prog">
                  <div class="but"></div>
                </div>
              </div>
            255
          </div>
        </li>
      </ul>
    </div>
  </div>
  </body>
  <script type="text/javascript">
  /*
    1.JS主要针对页面当中的HTML元素以及样式进行修改,从而得到特效
    2.我们一般用JS写特效,要知道触发特效的条件是什么
    3.促发这个条件的对象是谁
    4.写这个事件里面发生的事情
    5.获取鼠标的移动水平方向的距离
    6.this代表当前执行这个事件的对象
    (这个事件是谁做的 那么这个事件当中的this就是谁)
  */
  var oBut =document.getElementsByClassName("but");//通过元素的类名 是以一个数组的形式保存
  var oFont =document.getElementById("show");//通过ID名获取元素
  var oProg =document.getElementsByClassName("prog");
  var width = [0,0,0,0];
  var rgb = ["00","00","00"];
  for (var i=0;i<oBut.length;i++)//重复执行某一个语句(循环体)限制条件
  {
    oBut[i].index=i;//自定义一个index属性保存i
    oBut[i].onmousedown =function(e){//鼠标点击下去
      //event事件对象 clientX clientY
      var e = e || window.event;//做IE兼容
      this.x =e.clientX;//当前对象的属性去保存这个值(自定义一个x属性)
      var thisIndex = this;//定义一个变量保存this指向对象
      var lastLeft = width[this.index];
      //console.log("鼠标点击下去");
      document.onmousemove =function(e){//鼠标移动事件
        //console.log("鼠标移动事件");
        var e = e || window.event;//做IE兼容
        width[thisIndex.index] =e.clientX-thisIndex.x+lastLeft;
        if (width[thisIndex.index]>180)width[thisIndex.index]=180;
        if (width[thisIndex.index]<0)width[thisIndex.index]=0;    
        oBut[thisIndex.index].style.left =width[thisIndex.index]+"px";
        oProg[thisIndex.index].style.width =width[thisIndex.index]+"px";
        if (thisIndex.index ==0)
        {
oFont.style.fontSize =width[thisIndex.index]/180*40+8+"px";
          //驼峰命名法
        }else{
          var num = parseInt(width[thisIndex.index]/180*255);
          /*if (num<16)
          {
            numStr ="0"+num.toString(16);
          }else{
            numStr = num.toString(16);
          }*/
rgb[thisIndex.index-1] =num<16?"0"+num.toString(16):num.toString(16);
oFont.style.color ="#"+rgb[0]+rgb[1]+rgb[2];
        }
      }
document.onmouseup =function(){//鼠标松开事件
//console.log("鼠标松开事件");
this.onmousemove =null;//终止移动事件
this.onmouseup =null;//终止鼠标松开事件
      }
    }
  }
</script>
</html>


  分享到:  
0.2656s