通过javascript改变字体大小，内容页适用！
2022-12-01 加入收藏
第一种：
前端代码：
<span style="margin-left:30px;">字体：
<a onclick="add()" style="font-size:18px;font-weight:bold;" href="javascript:SetFont()">A+</a>
<a onclick="min()" style="font-size:16px;font-weight:bold;" href="javascript:SetFont()">A-</a>
</span>
<div id="nr">{$eyou.field.content}</div>前端JS代码：
<script>
var isClick=false;
var size=16;
var maxsize=22;
var minsize=14;
function add(){
isClick = true;
if(size>=maxsize){alert("不能再大了！！！")}
else{
size+=1;
}
}
function min(){
isClick = true;
if(size<=minsize){alert("不能再小了！！！")}
else{size-=1;}
}
function SetFont() {
var FontArea = document.getElementById("nr");//给内容范围设置一个id nr
if (isClick==true){
console.log("当前字体大小"+size+"px");
}
else{
size=size;
}
if(!FontArea)
{
return;
}
FontArea.style = 'font-size:'+size+ 'px';
var tagname=["td","span","div","a","li","ul","ol","p","font","b","tr","strong","table","section","pre","article","h1","h2","h3","h4","h5","h6"];
var length=tagname.length;
//遍历数组中的元素，逐一赋予字号
for(var k=0;k<length;k++){
tag=FontArea.getElementsByTagName(tagname[k]);
for(var i=0;i<tag.length;i++){
tag[i].style.fontSize=size+'px';
}
}
}
</script>第二种(前提不要给P标签加字体大小)：
前端代码：
<input id="Btn1" type="button" value="+" name=""/>
<input id="Btn2" type="button" value="-" name=""/>
<div id="nr" style="font-size:14px;">{$eyou.field.content}</div>前端JS代码：
<script>
window.onload= function(){
var oPtxt=document.getElementById("nr");
var oBtn1=document.getElementById("Btn1");
var oBtn2=document.getElementById("Btn2");
var num = 14; /*定义一个初始变量*/
oBtn1.onclick = function(){
num++;
oPtxt.style.fontSize=num+'px';
};
oBtn2.onclick = function(){
num--;
oPtxt.style.fontSize=num+'px';
}
}
</script>