##1.图片加载 慢
若您遇到图片加载很慢的问题,对这种情况,手机开发一般用canvas方法加载:
具体的canvas API 参见:http://javascript.ruanyifeng.com/htmlapi/canvas.html
下面举例说明一个canvas的例子:
<li><canvas></canvas></li>
js动态加载图片和li 总共举例17张图片!
var total=17;
var zWin=$(window);
var render=function(){
var padding=2;
var winWidth=zWin.width();
var picWidth=Math.floor((winWidth-padding*3)/4);
var tmpl ='';
for (var i=1;i<=totla;i++){
var p=padding;
var imgSrc='img/'+i+'.jpg';
if(i%4==1){
p=0;
}
tmpl +='<li style="width:'+picWidth+'px;height:'+picWidth+'px;padding-left:'+p+'px;padding-top:'+padding+'px;"><canvas id="cvs_'+i+'"></canvas></li>';
var imageObj = new Image();
imageObj.index = i;
imageObj.onload = function(){
var cvs =$('#cvs_'+this.index)[0].getContext('2d');
cvs.width = this.width;
cvs.height=this.height;
cvs.drawImage(this,0,0);
}
imageObj.src=imgSrc;
}
}
render();