简单的JavaScript字符串加密解密

 
简单的JavaScript字符串加密解密

<div>
    <input type="text" id="input" autofocus="autofocus">
    <button type="button" onclick="submit()">click</button>
</div>

<script>
    // 加密
    function encryption(str) {
        
        let newstr = [];
        let number = Math.random()*200; // 0 ~ 接近200
        number = Math.trunc(number)  // 0 ~ 199

        for (let i = 0; i < str.length; i++) {

            newstr.push(str.charCodeAt(i) + number);

        }
        newstr.push(number)
        return     escape(newstr.toString());
    }

    // 解密
    function decrypt(str) {

        str = unescape(str);
        
        // 把字符串以逗号切割为数组
        let arr = str.split(',');
        let number = arr.pop();
        
        let newarr = [];
        arr.forEach(function (item) {
            let temp = String.fromCharCode(item - number);
            newarr.push(temp)
        });

        return newarr.join('');
    }


    function submit() {
        var input = document.getElementById('input');
        var value = input.value;
        
        console.log("加密前: ", input.value);

        let a = encryption(value);
        console.log("加密后: ", a );
        console.log("解密前: "+ a);
        
        console.log("解密后: ", decrypt(a ));

    }

</script>