可编辑div移动光标位置

<div contenteditable="true" refs="input"></div>keepLastIndex(ev) {    console.log(ev)    console.log(window.getSelection)    console.log(document.selection)    if (window.getSelection) { //ie11 10 9 ff safari        ev.focus(); //解决ff不获取焦点无法定位问题        var range = window.getSelection(); //创建range        range.selectAllChildren(ev); //range 选择ev下所有子内容        range.collapseToEnd(); //光标移至最后    } else if (document.selection) { //ie10 9 8 7 6 5        var range = document.selection.createRange(); //创建选择对象        //var range = document.body.createTextRange();        range.moveToElementText(ev); //range定位到ev        range.collapse(false); //光标移至最后        range.select();    }},