for (var i = 1; i <= 7; i++) {//打印空格for (var j = 1; j <= 7 - i; j++) {document.write("&nbsp;");}//打印*for (var k = 1; k <= 2 * i - 1; k++) {document.write("*");}//换行document.write("<br/>");}document.write("--------------------------"+"<br/>");for (var i = 7; i >= 0; i--) {for (var j = 0; j < 7 - i; j++) {document.write("&nbsp;");}for (var k = 2 * i - 1; k > 0; k--) {document.write("*");}document.write("<br/>");}