How to set the font size in JavaScript

When JavaScript controls the font size settings on the company's official website, the news page will have a function for viewers to adjust their own text size. Therefore, in this idle time, sort out this function:

function setFontSize (id,content,params){      var oTarget = document.getElementById(id),        content = document.getElementById(content),        size = params.size || 14,        maxSize = params.maxSize || 20,        step = params.step || 2;        oBtn = '';        oBtn1 = null,        oBtn2 = null;         oTarget.innerHTML = oBtn;        oBtn1 = oTarget.childNodes[0];        oBtn2 = oTarget.childNodes[1];         oBtn1.onclick=function(){          if(size+step <= maxSize){            size+=step;          }else{            size = maxSize;            this.className+=' disabled';            this.disabled = true;          }          oBtn2.className.replace('disabled','');          oBtn2.disabled = false;          content.style.fontSize = size +'px';        }        oBtn2.onclick=function(){          if(size-step >= 12){            size-=step;          }else{            size = 12;            this.className+=' disabled'            this.disabled = true;          }          oBtn1.className.replace('disabled','');          oBtn1.disabled = false;          content.style.fontSize = size +'px';      }  }

Call method:

SetFontSize (id, contentid, {size:, maxSize, step:});/** id: id of the parent box used to store the add or remove buttons. * Contentid: id of the content to be stored. * {} An object that provides the set parameters. |-Szie: the start (default) font size. |-MaxSize: Maximum font size. |-Step: the increment value. */

Tip: You can use font-size: 0 to hide the value of the Input element, and then customize the button style.