Javascript method to output a square pattern with a specified number of lines

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Javascript method to output a square pattern with a specified number of lines_javascript skills

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May 16, 2016 pm 03:47 PM

javascriptoutput

The example in this article describes the method of using JavaScript to output a square pattern with a specified number of lines. Share it with everyone for your reference. The details are as follows:

Javascript implements the output of a square pattern with a specified number of lines: Click to generate a pattern, and there will be 2 prompt boxes. 1. Enter the characters that make up the pattern. It can only be 1 character. 2. Enter the number of square lines. If it is greater than 10, It will be set to 10 lines

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> 生成正方形 </title>
<Script type='text/javascript'>
//动态测字符的宽度，传入字符，放在span，判断宽度变化，返回
function get_width(zifu){
if(cwidth.innerHTML.length>0)cwidth.innerHTML='';//路过有元素，清空
var oldwidth=cwidth.offsetWidth;
cwidth.innerHTML=zifu;
var zifu_width=cwidth.offsetWidth-oldwidth;
cwidth.innerHTML='';
//alert(zifu_width);
return zifu_width;
}
//输出正方形函数
function create(){
var tuxing=prompt('请输入图案，必须1个字符');//图案，路 a 
if(tuxing==null||tuxing==''||tuxing.length>1){
alert('请输入图 案,图案必须1个字符');
return false;
}
//提示框，输入行数
var count=prompt('请输入正方形的行数');
if(count==null||count==''||count<1||isNaN(count)){
alert('您的输入的行数存在问题，1.不得空2.大于1 3.不得为非数字');
return false;
}
//根据行数，得到一行的字符窜
if(count>10){count=10;alert('输入的行数大于10，自动修改为10');}
var hangstr='';
for(i=1;i<=count;i++){
hangstr+=tuxing+' ';
//判断变长是否超过文档的
if(get_width(hangstr)>maxw-100){
alert('过长的行');
count=i-1;
hangstr=oldhangstr;
break;
}
oldhangstr=hangstr;
}
//生成图形字符串
var tustr='';//图形字符串
for(i=1;i<=count;i++)tustr+=hangstr+'<br/>';
//把图形字符串放入图形层
zengfang.innerHTML=tustr;
}
</script>
 </head>
 <body>
 <div id='zengfang'>此处显示图形</div>
 <input type='button' value='生成正方形图案' onclick='create()'>
<br>
<span id='cwidth'></span>
<!-- 测试获取字符串的宽度，因为行数过大，会超过文档范围，而发生折行
<input type='text' value='' id='text1'>
 <input type='button' value='显示字符宽度' onclick='get_width(text1.value)'>
 -->
 <Script type='text/javascript'>
 var maxh=document.body.clientHeight;//文档高 正方形最大长度
 var maxw=document.body.clientWidth;//文档宽，正方形最大长度
 //alert(maxh);
 //alert(maxw);
 </script>
 </body>
</html>

Rendering:

Pattern character: A, number of lines: 5

I hope this article will be helpful to everyone’s JavaScript programming design.

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