document.onmousedown=function(event){
var obj = event.target
var endCB=function (e) {
console.log(e,'jietu')
}
if(obj.id=='feedback'){
var ks=new kscreenshot({
key: 65,//65指键盘中的A
immediately:true,
endCB:endCB
})
console.log(ks,'ks')
}
}