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  • 9-7

    大小写转换

    <script type="text/javascript">
                var registor = "a123456",
                username = "A123456";
                console.log( username.toLowerCase() );
            </script>

    定时器

    setInterval(function() {
                    console.log("I am setInterval");
                }, 1000);

    清除定时器

                var clock = setInterval(function(){
                     console.log("I am clock");
                }, 1000);
                
                setTimeout(function(){
                    clearInterval(clock);
                }, 10000)

    截取字符串长度

    <script type="text/javascript">
                        var title = "主席出席二十国集团领导人杭州峰会系列活动纪实";
                        document.write( title.substr(0, 10) + "...");
     </script>

    数组的增删改查

    <script type="text/javascript">
                var arr = ["orange", "mango", "banana", "sugar", "tea"];
                console.log(arr);
                arr.splice(2, 0, "fish");
                console.log(arr);
                arr.splice(5, 1);
                console.log(arr);
    </script>

    字符串的替换

    <script type="text/javascript">
                var content = "abc";
                console.log( content.replace("b", "q") );
            </script>

    打开一个新的页面

    <script type="text/javascript">
                window.open("http://www.baidu.com","_blank","width=300, height=200");
            </script>

    验证邮箱

    <script type="text/javascript">
                var email = "shann@wengdocomcn",
                    atPos = email.indexOf("@"),
                    dotPos = email.lastIndexOf(".");
                console.log(atPos, dotPos);
                
                if( atPos <= 0 || dotPos < atPos ){
                    alert("请输入正确的电子邮箱");
                }
            </script>

    弹出对话框

    <script type="text/javascript">
                var result = confirm("你确认删除?");
                console.log(result);
                if( result ){
                    alert("正在删除中...");
                }else{
                    alert("你取消了删除");
                }
            </script>

    拆分字符串

     <script type="text/javascript">
                var username = "a123456";
                console.log(username.charAt(0));
                for(var i = 0; i < username.length; i++) {
                    document.write('<span class="font' + i + '">' + username.charAt(i) + "</span>");
                }
            </script>

    浏览记录后退

    <script type="text/javascript">
                setTimeout(function(){
                    history.back();
                }, 3000);
            </script>
    <h1 id="title">我是h1标题</h1>
    	    <script type="text/javascript">
    	    	// 1. 定义变量title
    	    	// 2. 获取到页面内的#title的元素节点=>title
    	    	// 3. 修改title的内容为“我已经被修改了。”
    	    	// 4. 修改title的字体颜色为红色
    	    	
    	    	// 1. 定义变量title
                // 2. 获取到页面内的#title的元素节点=>title
    	    	var title = document.querySelector("#title");
    	    	
    	    	// 3. 修改title的内容为“我已经被修改了。”
    	    	title.innerHTML = "我已经被修改了。";
    	    	
    	    	// 4. 修改title的字体颜色为红色
    	    	title.style.color = "red";
    	    </script>
    
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  • 原文地址:https://www.cnblogs.com/hunting/p/5850948.html
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