cvs.drawImage(this,0,0)的this
this該怎么理解？
imgObj.onload = function(){
???? var cvs = $('#cvs_'+this.index)[0].getContext('2d');
???? cvs.width = this.width;
???? cvs.height = this.height;
???? cvs.drawImage(this,0,0);
}
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this該怎么理解？
imgObj.onload = function(){
???? var cvs = $('#cvs_'+this.index)[0].getContext('2d');
???? cvs.width = this.width;
???? cvs.height = this.height;
???? cvs.drawImage(this,0,0);
}
2016-07-14
舉報
2016-07-17
當imgObj加載完成后，this指向的imgObj的對象，this.width就是當前imgObj.width，然后通過當前imgObj的寬度值來賦值給canvas的寬度。