Javascript rounded div implementation code_javascript skills

Nowadays, the rounded corners are generally controlled by pictures. This method has its advantages (the resulting rounded corners are smooth). But at the same time, he also requires matching pictures. If he wants to dynamically change the style and color of the div, it will be a bit difficult. There is also the use of js to achieve it.
The implemented calling code is as follows

Copy code The code is as follows:

var objDiv = getRoundDiv.call(document,"solid 1px yellow","#dddddd")
objDiv.Div.style.width="100px";
objDiv.Content.style.margin="6 6 6 6 "
objDiv.Content.innerText="This is a rounded div test"
document.body.appendChild(objDiv.Div);

This way A rounded div
is generated. Implementation principle: The principle is actually very simple. Add three lines to the top and bottom of the div, and use the different lengths of these three lines to produce the effect of rounded corners.

Implementation process: How to implement these three lines. Use the element and set its height to 1px. If you want to display borders, add left and right borders to them. After adding the lines, put the content div and these three lines in a container. This container is also a div. Finally, a div class is returned. This class contains two attributes. One is a container div. Through this container div, the position, size, height and other attributes of the graphics can be controlled. Another attribute is the content div, through which you can set the content, margin, font color, background color, font size, and other attributes of this div.

Note: Calling the getRoundDiv method requires passing a method context. My understanding is that the method context is equivalent to a pointer pointing to the object on which the method is called. Why use this method context? For example, if you want to create a new rounded div in the popup document generated by IE's creatPopup method, since the popup can only load controls created by itself, the popup object can be passed into the method and become the object pointed to by the method context. There are two methods of passing context function.call(obj,"arg1","arg2") similar to this. The other is function.apply(obj,arguments)

The detailed code is as follows:

Copy code The code is as follows :

/**************************************************************************/
/*RoundDiv.js 产生一个圆角div
调用前需设置函数上下文(上下文是指，要创建div的窗口) 例如 var objDiv = getRoundDiv.call(document,"","#dddddd")
函数参数argBorderStyle: 边框样式，字符串 例如 "1px solid black"
函数参数argBgColor: 背景颜色，字符串 例如 "#ffffff"
现在只支持边框为1像素 如果超过1像素产生的图形会比较奇怪
如果不设置边框 则没有边框 可以正常使用
本函数返回的是一个RoundDiv自定义类
如果要设置div的内容请用 obj.Content.innerHtml 或 obj.Content.innerText设置
如果要设置div的高度请用 obj.Div.style.width obj.Div.style.height设置
*/
/**************************************************************************/
/**************************************************************************/
//取得一个圆角div
function getRoundDiv(argBorderStyle,argBgColor){

    //创建元素
    var divPane =this.createElement("div")
    var divContent =this.createElement("div")
    var divContentMax =this.createElement("div")
    var bTop =this.createElement("b")
    var bBottom =this.createElement("b")
    var bTop1 =this.createElement("b")
    var bTop2 =this.createElement("b")
    var bTop3 =this.createElement("b")
    var bTop4 =this.createElement("b")
    var bBottom1 =this.createElement("b")
    var bBottom2 =this.createElement("b")
    var bBottom3 =this.createElement("b")
    var bBottom4 =this.createElement("b")

    //背景设置
    divPane.style.backgroundColor=argBgColor;
    divContent.style.backgroundColor=argBgColor;
    divContentMax.style.backgroundColor=argBgColor;

    bTop1.style.backgroundColor=argBgColor;
    bTop2.style.backgroundColor=argBgColor;
    bTop3.style.backgroundColor=argBgColor;
    bTop4.style.backgroundColor=argBgColor;
    bBottom1.style.backgroundColor=argBgColor;
    bBottom2.style.backgroundColor=argBgColor;
    bBottom3.style.backgroundColor=argBgColor;
    bBottom4.style.backgroundColor=argBgColor;
    bTop.style.backgroundColor="#ffffff";
    bBottom.style.backgroundColor="#ffffff";

    //样式设置
    bTop.style.overflow="hidden";
    bBottom.style.overflow="hidden";
    bTop1.style.overflow="hidden";
    bTop2.style.overflow="hidden";
    bTop3.style.overflow="hidden";
    bTop4.style.overflow="hidden";
    bBottom1.style.overflow="hidden";
    bBottom2.style.overflow="hidden";
    bBottom3.style.overflow="hidden";
    bBottom4.style.overflow="hidden";

    bTop.style.display="block";
    bBottom.style.display="block";
    bTop1.style.display="block";
    bTop2.style.display="block";
    bTop3.style.display="block";
    bTop4.style.display="block";
    bBottom1.style.display="block";
    bBottom2.style.display="block";
    bBottom3.style.display="block";
    bBottom4.style.display="block";

    
    //高度设置
    divContent.style.height="100%";
    divContentMax.style.height="100%";

    bTop1.style.height="1px";
    bTop2.style.height="1px";
    bTop3.style.height="1px";
    bTop4.style.height="2px";

    bBottom1.style.height="1px";
    bBottom2.style.height="1px";
    bBottom3.style.height="1px";
    bBottom4.style.height="2px";

    
    //边框设置
    divContentMax.style.borderLeft=argBorderStyle
    divContentMax.style.borderRight=argBorderStyle

    bTop1.style.borderLeft=argBorderStyle;
    bTop1.style.borderRight=argBorderStyle;
    bTop1.style.borderTop=argBorderStyle;
    bTop2.style.borderLeft=argBorderStyle;
    bTop2.style.borderRight=argBorderStyle;
    bTop3.style.borderLeft=argBorderStyle;
    bTop3.style.borderRight=argBorderStyle;
    bTop4.style.borderRight=argBorderStyle;
    bTop4.style.borderLeft=argBorderStyle;
    bBottom1.style.borderLeft=argBorderStyle;
    bBottom1.style.borderRight=argBorderStyle;
    bBottom1.style.borderTop=argBorderStyle;
    bBottom2.style.borderLeft=argBorderStyle;
    bBottom2.style.borderRight=argBorderStyle;
    bBottom3.style.borderLeft=argBorderStyle;
    bBottom3.style.borderRight=argBorderStyle;
    bBottom4.style.borderLeft=argBorderStyle;
    bBottom4.style.borderRight=argBorderStyle;

    
    //空白间距设置
    bTop1.style.margin="0 4px 0 4px"
    bTop2.style.margin="0 3px 0 3px"
    bTop3.style.margin="0 2px 0 2px"
    bTop4.style.margin="0 1px 0 1px"

    bBottom1.style.margin="0 4px 0 4px"
    bBottom2.style.margin="0 3px 0 3px"
    bBottom3.style.margin="0 2px 0 2px"
    bBottom4.style.margin="0 1px 0 1px"

    //控件拼装
    bTop.appendChild(bTop1);
    bTop.appendChild(bTop1);
    bTop.appendChild(bTop2);
    bTop.appendChild(bTop3);
    bTop.appendChild(bTop4);    
    bBottom.appendChild(bBottom4);
    bBottom.appendChild(bBottom3);
    bBottom.appendChild(bBottom2);
    bBottom.appendChild(bBottom1);

    divContentMax.appendChild(divContent)
    divPane.appendChild(bTop)
    divPane.appendChild(divContentMax)
    divPane.appendChild(bBottom)
    var objRoundDiv = new RoundDiv();
    objRoundDiv.Div=divPane;
    objRoundDiv.Content=divContent;
    return objRoundDiv;

}
/**************************************************************************/
/**************************************************************************/
//自定义类（用来装载div对应内容）
function RoundDiv(){
    this.content=0;//div内容
    this.div=0;//div容器
}
/**************************************************************************/