html img热区坐标根据屏幕大小自适应

//根据分辨率自适应热区坐标

function changeCoords(){

var width = document.body.offsetWidth;

var height = document.body.offsetHeith;

if (1920 == width) return;

var percent = width/1920;

$(".act").each(function(){

var coords = $(this).attr("coords");

var arr = coords.split(",");

for(var i=0;i<arr.length;i++){

arr[i] *= percent;

}

var str = arr.join(",");

$(this).attr("coords",str);

});

}