javascript - inner.HTML 不在 if 函数内居中

Question

代码示例:

var msg = document.getElementById("message");

//constructor
function person(name,birthMonth,profession){
//set default values to a person
this.name = name || "No Name";
this.birthMonth = birthMonth || "No Month";
this.profession = profession || "Nobody";

    //construction of the display function
    this.display=function (){
        msg.innerHTML += "<center><p>" + this.name + " " + "was born on " + this.birthMonth + " and they are a " + this.profession + ". "

                //Month comparisons
                if (this.birthMonth=="April"){
                    msg.innerHTML += "They are meh because they were born in April.(eww)"
                }
                else if (this.birthMonth=="January"){
                    msg.innerHTML += "They are the best because they were born in the <strong>best month!</strong>"
                }
                else {
                    msg.innerHTML += "They are okay, at best."
                }
        //close paragraph tag       
        msg.innerHTML += "<hr></p></center>"
    }

}

问题:为什么 if/else 语句中的 msg.innerHTML 不居中？中心标签不应该捕获它们吗？在 HTML 输出中，if/else 之前的第一个语句居中。另外， hr 打印正确，所以我相信它也能输出。

谢谢!

Answer 1

当第一个innerHTML被调用时，浏览器会自动关闭中心标签。

使用完整消息构建一个字符串变量，然后在末尾设置innerHTML - 当您关闭中心标记时，浏览器将不需要执行任何操作，您的文本将根据您的需要呈现。

this.display=function (){
var mess = '';
    mess += "<center><p>" + this.name + " " + "was born on " + this.birthMonth + " and they are a " + this.profession + ". "

            //Month comparisons
            if (this.birthMonth=="April"){
               mess += "They are meh because they were born in April.(eww)"
            }
            else if (this.birthMonth=="January"){
                mess += "They are the best because they were born in the <strong>best month!</strong>"
            }
            else {
                mess += "They are okay, at best."
            }
    //close paragraph tag     
    mess += "<hr></p></center>"
    msg.innerHTML = mess;
}