uniapp less 使用js报错

@content: `"aaa".toUpperCase()`;  

    #randomColor {  
        @randomColor: ~"rgb(`Math.round(Math.random() * 256)`,`Math.round(Math.random() * 256)`,`Math.round(Math.random() * 256)`)";  
    }  

    #wrap {  
        width: ~"`Math.round(Math.random() * 100)`px";  

        &:after {  
            content: @content;  
        }  

        height:~"`window.innerHeight`px";  
        alert:~"`alert(1)`";  
        #randomColor();  
        background-color: @randomColor;  
    }

然后就报错了
18:07:22.097 Module build failed (from ./node_modules/less-loader/dist/cjs.js):
18:07:22.097 @content:"aaa".toUpperCase();
18:07:22.101 ^
18:07:22.101 Inline JavaScript is not enabled. Is it set in your options?