javascript

最新推荐文章于 2025-05-20 08:12:16 发布

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最新推荐文章于 2025-05-20 08:12:16 发布

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文章标签： javascript

本文链接：https://blog.youkuaiyun.com/qq_34533702/article/details/74990087

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JavaScript学习

javascript 改变HTML样式：



<script>
function test(){
    x=document.getElementById("div");
    x.style.color="red";//改变html的样式
}
</script>



     
     
      
      
Hello,world

点击前：

点击后

javascript 验证，关键词：isNaN 判断是不是一个数



<script>
function test(){
    alert(isNaN("3"));
    alert(isNaN(3));
}
</script>

运行后：

javascript改变字体样式：



<script>
function test(){
		var z = document.getElementById("p");
		z.align =  "right";
		z.style.color = "red";
		z.style.fontSize = "100px";
		var c = document.getElementById("div");
		c.align =  "right";
		c.style.color = "red";
		c.style.fontSize = "100px";
    	}
}
</script>


你好

      
      
       
       
  您好

javascript运算：



<script>
function test(){
    var x ;
    x = 3;
    y = 2;
    x = x + y;
    alert(x);
    alert(y);
}
</script>



<script>
function test(){
    var x,y,z;
    x =1;
    y =2;
    z = x+y;
    alert(z);
}
</script>

函数传参：



<script>
function test1(x,y){
    return x+y;
}
function test(x,y){
    alert(x,y);
}
</script>

js中运算符：

= ：赋值，

==：等于

===：值一样，类型也一样

js数组



<script>
function test(){
			var shuzu = new Array;
			shuzu[0] = "asd";
			shuzu[1] = "fddsdfsdfs";
			shuzu[2] = "asdsdffd";
			for(var i = 0; i

js字符串转数字：



<script>
function test(){
	var x = "1";
	var y = 1;
	alert(parseInt(x)+y);
</script>

获取时间：



<script>
function test(){
				var date = new Date();
				alert(date);
				alert(date.getTime());
				alert(date.toUTCString());
				alert(date.getDay());
				alert(date.getHours() + "时");
				alert(date.getMinutes() + "分" );
				alert(date.getSeconds() + "秒");
				alert(date.getMilliseconds() + "毫秒");
			
}
</script>