h5　canvas　　在canvas上画图　在canvas上写字　文字换行

//canvas文字换行function write_text_other_line_auto(ctx,font,align,color,text,x,y,line_count,line_height,text_indent){ctx.font = font;ctx.textAlign = align;ctx.fillStyle = color;var row_count = text.length/line_count;var first_row_line_count;var x1,y1;for(var i=0;i<=row_count;i++){if(i==0){ctx.fillText(text.substring(0,(line_count*(i+1)-text_indent)),x+(text_indent*26),y+(line_height*i));first_row_line_count = (line_count*(i+1)-text_indent);}else{ctx.fillText(text.substring(line_count*(i-1)+first_row_line_count,first_row_line_count+line_count*i),x,y+(line_height*i));y1 = y+(line_height*i);}}return y1;}