使用renderHeader、render函数
例子：
column:[
{},
...,
{
title:'较年初占比变化',
key:''lastYearChange,
renderHeader:(h,params) => {
var text = '较年初<br>占比变化';
return h('div',{
domProps:{
innerHTML: text
}
})
},
rander: ( h, params) =>{
if(params.row.lastYearChange.substr(0,1) === '-'){
return h(
'span',
{
style:{
color:'#fff',
fontWeight:'bold'
}
},
params.row,lastYearChange
);
}else if (params.row.lastYearChange == 0){
return h('span', params.row.lastYearChange);
}
}
}
]