字符串

字符串

const profile = {
	name: "kangkang",
	age: 21,
	sayName: function () {
		console.log("my name is " + this.name)
	},
	sayName2: function() {
		console.log(`my name is ${this.name}`)
	}, 
	sayName3: function() {
		console.log(`my name is ${this.name} ${`年龄是 ${this.age}`}`)
	}
}

练习

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>模版字符串</title>
    <style>
        table {
            border-collapse: collapse;
        }
        td {
            border: 1px solid #eee;
        }
        th {
            text-align: center;
        }
    </style>
</head>

<body>
    <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script>
    <script type="text/javascript">
    const tmpl = function() {
        return {
            title: "前端",
            data: [{
                title: '布局基础',
                date: ["html", "css"]
            }, {
                title: '网页特效',
                date: ["javascript", "jquery"]
            }, {
                title: '框架',
                date: ["bootstrap", "vue"]
            }]
        }
    }
    
    let tmpl2= tmpl()
    let {title: Btitle, data: datas} = tmpl2
    let value =[]
    value.push(Btitle)
    datas.forEach((e,i) => {
        let {title:tmp,date:[tmp2,tmp3]} = e

        value.push(tmp)
        value.push(tmp2)
        value.push(tmp3)
    })
    
    
    let tNode = document.createElement("table")
    tNode.innerHTML= `<th>${value[0]}</th>
        <tr>
            <td>${value[1]}</td>
            <td>${value[2]}</td>
            <td>${value[3]}</td>
        </tr>
        <tr>
            <td>${value[4]}</td>
            <td>${value[5]}</td>
            <td>${value[6]}</td>
        </tr>
        <tr>
            <td>${value[7]}</td>
            <td>${value[8]}</td>
            <td>${value[9]}</td>
        </tr>
    `
    document.body.appendChild(tNode)
    </script>
</body>
</html>

字符串新的方法

  • padStart

let str = "haha" str.padStart(5,"gou") //"ghaha"

将gou添加到str前面，当长度超过（第一个参数）拼接之和后会截取掉用来拼接的字符

  • padEnd

    与padStart相同，不过是在末尾添加

  • repeat

    let str = "ab".repeat(8) // abababababababab

  • startsWith

    检测某个字符串是否在另外字符串的开头

    let str = "my name is kangkang" str.startsWith("my ")// true

  • endsWith

    检测某个字符串是否在另外字符串的开头

    let str = "my name is kangkang" str.endsWith("kang")// true

  • includes

    检测某个字符串是否在另外字符串内

    let str = "my name is kangkang" str.includes(" is")// true

遍历字符串

思路：转换为字符数组来进行遍历

let str = "kangkang"
let str2 = Array.prototype.slice.call(str)//
let str3 = str.split("")
let str4 = [...str]
let [...str5] = str


str5.forEach((e) => {
	console.log(e)
})

而遍历的作用就是为了操作

for-of遍历字符串

let str = "abcdefg" for

Unicode

"🐶".codePointAt(0).toString(16) // "1f436"

"\u{1f436}" //"🐶"

posted on 2019-06-19 17:19  2481  阅读(156)  评论(0)  编辑  收藏  举报

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