比较句柄帮助器

我在代码中使用块助手来比较值的工作，但每次我运行这个代码的问题，我得到这个错误按摩在我的网页视图

Error: Missing helper: "compare" at Object.<anonymous> (/opt/lampp/htdocs/x/chessMult/regtest/using-passport-with-sequelize-and-mysql-master/node_modules/handlebars/dist/cjs/handlebars/helpers/helper-missing.js:19:13) at Object.eval (eval at createFunctionContext (/opt/lampp/htdocs/x/chessMult/regtest/using-passport-with-sequelize-and-mysql-master/node_modules/handlebars/dist/cjs/handlebars/compiler/javascript-compiler.js:254:23), <anonymous>:8:91) at main (/opt/lampp/htdocs/x/chessMult/regtest/using-passport-with-sequelize-and-mysql-master/node_modules/handlebars/dist/cjs/handlebars/runtime.js:175:32) at ret (/opt/lampp/htdocs/x/chessMult/regtest/using-passport-with-sequelize-and-mysql-master/node_modules/handlebars/dist/cjs/handlebars/runtime.js:178:12) at ret (/opt/lampp/htdocs/x/chessMult/regtest/using-passport-with-sequelize-and-mysql-master/node_modules/handlebars/dist/cjs/handlebars/compiler/compiler.js:525:21) at ExpressHandlebars._renderTemplate (/opt/lampp/htdocs/x/chessMult/regtest/using-passport-with-sequelize-and-mysql-master/node_modules/express-handlebars/lib/express-handlebars.js:247:12) at ExpressHandlebars.<anonymous> (/opt/lampp/htdocs/x/chessMult/regtest/using-passport-with-sequelize-and-mysql-master/node_modules/express-handlebars/lib/express-handlebars.js:173:21) 

我的index.hbs文件

 {{#compare pageCount ">" 1 }} <ul class="pagination"></ul> {{#compare currentPage ">" 1 }} <li><a href="/?page=1"> &laquo;</a></li> {{/compare}} {{/compare}} 

我的auth.js文件

 res.render('index', {x:"1888", "personList": personList,data: data, pageSize: pageSize, pageCount: pageCount,currentPage: currentPage}); 

我的app.js文件

 const exphbs = require('express-handlebars'); const hbs = exphbs.create({ // Specify helpers which are only registered on this instance. helpers: { foo: function () { return 'FOO!'; }, extname: ".hbs", compare: function(lvalue, rvalue, options) { if (arguments.length < 3) throw new Error("Handlerbars Helper 'compare' needs 2 parameters"); var operator = options.hash.operator || "=="; var operators = { '==': function(l,r) { return l == r; }, '===': function(l,r) { return l === r; }, '!=': function(l,r) { return l != r; }, '<': function(l,r) { return l < r; }, '>': function(l,r) { return l > r; }, '<=': function(l,r) { return l <= r; }, '>=': function(l,r) { return l >= r; }, 'typeof': function(l,r) { return typeof l == r; } } if (!operators[operator]) throw new Error("Handlerbars Helper 'compare' doesn't know the operator "+operator); var result = operators[operator](lvalue,rvalue); if( result ) { return options.fn(this); } else { return options.inverse(this); } } } }); //For Handlebars app.set('views', './app/views') app.engine('.hbs', exphbs({extname: '.hbs'})); app.set('view engine', '.hbs'); 

哪里错了？

Answer 1

你在app.js文件有一个小错误

 const exphbs = require('express-handlebars'); const hbs = exphbs.create({ //... }); //For Handlebars app.set('views', './app/views'); app.engine('.hbs', hbs.engine); // <===== Use `hbs.engine` app.set('view engine', '.hbs');