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js scale images proportionally

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Release: 2016-11-10 13:24:06
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//第一个参数是当前对象this,第二个是宽,第三个是高
 
function datuIMG(datu,kuan,chang){
datu.width = kuan*100;
datu.height = chang*100;
//图片等比例缩小
if(datu.width*chang>datu.height*kuan){
datu.width=kuan;
datu.height=(kuan*chang)/kuan;
}
else{ 
datu.width=(chang*kuan)/chang;
datu.height=chang;
}
//图片居中显示
//图片宽小于设定的边框宽
if(datu.width<=kuan){
var kk = parseInt((kuan-datu.width)/2);
datu.style.paddingRight = kk + "px";
datu.style.paddingLeft = kk + "px";
}
//图片高小于设定的边框高
if(datu.height<=chang){
var gg = parseInt((chang-datu.height)/2);
datu.style.paddingTop = gg + "px";
datu.style.paddingBottom = gg + "px";
}
 
}
 
 
//使用
 
在img上写onload事件  onload=" datuIMG(this,100,80)"
 
 
最终的效果就会将无论多大的图片 等比缩放成 100*80
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