js添加和删除class

原生主要有三种方法：

1、className

var DomClass = document.getElementById("id").className;
//删除 pat
DomClass = DomClass.replace('pat',"");
document.getElementById("id").className = DomClass;

//添加 pad
DomClass = DomClass.concat('pat');
document.getElementById("id").className = DomClass;

//替换 pad
DomClass = DomClass.replace('pat',"pad");
document.getElementById("id").className = DomClass;

2、es5的classList

var DomClass = document.getElementById("id");
//删除 pat
DomClass.classList.remove("pat");

//添加 pad
DomClass.classList.add("pat");

3、同一 setAttribute

var DomClass = document.getElementById("id").getAttribute('class');
//删除 pat
DomClass = DomClass.replace('pat',"");
document.getElementById("id").setAttribute('class',DomClass);

//添加 pad
DomClass = DomClass.concat('pat');
document.getElementById("id").setAttribute('class',DomClass);

//替换 pad
DomClass = DomClass.replace('pat',"pad");
document.getElementById("id").setAttribute('class',DomClass);

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