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>
